<!DOCTYPE html><html lang="en"><head><meta charset="utf-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta name="generator" content="rustdoc"><meta name="description" content="Source of the Rust file `/home/runner/.cargo/registry/src/index.crates.io-6f17d22bba15001f/heapless-0.7.17/src/vec.rs`."><title>vec.rs - source</title><script>if(window.location.protocol!=="file:")document.head.insertAdjacentHTML("beforeend","SourceSerif4-Regular-6b053e98.ttf.woff2,FiraSans-Regular-0fe48ade.woff2,FiraSans-Medium-e1aa3f0a.woff2,SourceCodePro-Regular-8badfe75.ttf.woff2,SourceCodePro-Semibold-aa29a496.ttf.woff2".split(",").map(f=>`<link rel="preload" as="font" type="font/woff2" crossorigin href="../../static.files/${f}">`).join(""))</script><link rel="stylesheet" href="../../static.files/normalize-9960930a.css"><link rel="stylesheet" href="../../static.files/rustdoc-42caa33d.css"><meta name="rustdoc-vars" data-root-path="../../" data-static-root-path="../../static.files/" data-current-crate="heapless" data-themes="" data-resource-suffix="" data-rustdoc-version="1.84.0 (9fc6b4312 2025-01-07)" data-channel="1.84.0" data-search-js="search-92e6798f.js" data-settings-js="settings-0f613d39.js" ><script src="../../static.files/storage-59e33391.js"></script><script defer src="../../static.files/src-script-56102188.js"></script><script defer src="../../src-files.js"></script><script defer src="../../static.files/main-5f194d8c.js"></script><noscript><link rel="stylesheet" href="../../static.files/noscript-893ab5e7.css"></noscript><link rel="alternate icon" type="image/png" href="../../static.files/favicon-32x32-6580c154.png"><link rel="icon" type="image/svg+xml" href="../../static.files/favicon-044be391.svg"></head><body class="rustdoc src"><!--[if lte IE 11]><div class="warning">This old browser is unsupported and will most likely display funky things.</div><![endif]--><nav class="sidebar"><div class="src-sidebar-title"><h2>Files</h2></div></nav><div class="sidebar-resizer"></div><main><rustdoc-search></rustdoc-search><section id="main-content" class="content"><div class="main-heading"><h1><div class="sub-heading">heapless/</div>vec.rs</h1><rustdoc-toolbar></rustdoc-toolbar></div><div class="example-wrap"><div data-nosnippet><pre class="src-line-numbers">
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<a href="#952" id="952">952</a>
<a href="#953" id="953">953</a>
<a href="#954" id="954">954</a>
<a href="#955" id="955">955</a>
<a href="#956" id="956">956</a>
<a href="#957" id="957">957</a>
<a href="#958" id="958">958</a>
<a href="#959" id="959">959</a>
<a href="#960" id="960">960</a>
<a href="#961" id="961">961</a>
<a href="#962" id="962">962</a>
<a href="#963" id="963">963</a>
<a href="#964" id="964">964</a>
<a href="#965" id="965">965</a>
<a href="#966" id="966">966</a>
<a href="#967" id="967">967</a>
<a href="#968" id="968">968</a>
<a href="#969" id="969">969</a>
<a href="#970" id="970">970</a>
<a href="#971" id="971">971</a>
<a href="#972" id="972">972</a>
<a href="#973" id="973">973</a>
<a href="#974" id="974">974</a>
<a href="#975" id="975">975</a>
<a href="#976" id="976">976</a>
<a href="#977" id="977">977</a>
<a href="#978" id="978">978</a>
<a href="#979" id="979">979</a>
<a href="#980" id="980">980</a>
<a href="#981" id="981">981</a>
<a href="#982" id="982">982</a>
<a href="#983" id="983">983</a>
<a href="#984" id="984">984</a>
<a href="#985" id="985">985</a>
<a href="#986" id="986">986</a>
<a href="#987" id="987">987</a>
<a href="#988" id="988">988</a>
<a href="#989" id="989">989</a>
<a href="#990" id="990">990</a>
<a href="#991" id="991">991</a>
<a href="#992" id="992">992</a>
<a href="#993" id="993">993</a>
<a href="#994" id="994">994</a>
<a href="#995" id="995">995</a>
<a href="#996" id="996">996</a>
<a href="#997" id="997">997</a>
<a href="#998" id="998">998</a>
<a href="#999" id="999">999</a>
<a href="#1000" id="1000">1000</a>
<a href="#1001" id="1001">1001</a>
<a href="#1002" id="1002">1002</a>
<a href="#1003" id="1003">1003</a>
<a href="#1004" id="1004">1004</a>
<a href="#1005" id="1005">1005</a>
<a href="#1006" id="1006">1006</a>
<a href="#1007" id="1007">1007</a>
<a href="#1008" id="1008">1008</a>
<a href="#1009" id="1009">1009</a>
<a href="#1010" id="1010">1010</a>
<a href="#1011" id="1011">1011</a>
<a href="#1012" id="1012">1012</a>
<a href="#1013" id="1013">1013</a>
<a href="#1014" id="1014">1014</a>
<a href="#1015" id="1015">1015</a>
<a href="#1016" id="1016">1016</a>
<a href="#1017" id="1017">1017</a>
<a href="#1018" id="1018">1018</a>
<a href="#1019" id="1019">1019</a>
<a href="#1020" id="1020">1020</a>
<a href="#1021" id="1021">1021</a>
<a href="#1022" id="1022">1022</a>
<a href="#1023" id="1023">1023</a>
<a href="#1024" id="1024">1024</a>
<a href="#1025" id="1025">1025</a>
<a href="#1026" id="1026">1026</a>
<a href="#1027" id="1027">1027</a>
<a href="#1028" id="1028">1028</a>
<a href="#1029" id="1029">1029</a>
<a href="#1030" id="1030">1030</a>
<a href="#1031" id="1031">1031</a>
<a href="#1032" id="1032">1032</a>
<a href="#1033" id="1033">1033</a>
<a href="#1034" id="1034">1034</a>
<a href="#1035" id="1035">1035</a>
<a href="#1036" id="1036">1036</a>
<a href="#1037" id="1037">1037</a>
<a href="#1038" id="1038">1038</a>
<a href="#1039" id="1039">1039</a>
<a href="#1040" id="1040">1040</a>
<a href="#1041" id="1041">1041</a>
<a href="#1042" id="1042">1042</a>
<a href="#1043" id="1043">1043</a>
<a href="#1044" id="1044">1044</a>
<a href="#1045" id="1045">1045</a>
<a href="#1046" id="1046">1046</a>
<a href="#1047" id="1047">1047</a>
<a href="#1048" id="1048">1048</a>
<a href="#1049" id="1049">1049</a>
<a href="#1050" id="1050">1050</a>
<a href="#1051" id="1051">1051</a>
<a href="#1052" id="1052">1052</a>
<a href="#1053" id="1053">1053</a>
<a href="#1054" id="1054">1054</a>
<a href="#1055" id="1055">1055</a>
<a href="#1056" id="1056">1056</a>
<a href="#1057" id="1057">1057</a>
<a href="#1058" id="1058">1058</a>
<a href="#1059" id="1059">1059</a>
<a href="#1060" id="1060">1060</a>
<a href="#1061" id="1061">1061</a>
<a href="#1062" id="1062">1062</a>
<a href="#1063" id="1063">1063</a>
<a href="#1064" id="1064">1064</a>
<a href="#1065" id="1065">1065</a>
<a href="#1066" id="1066">1066</a>
<a href="#1067" id="1067">1067</a>
<a href="#1068" id="1068">1068</a>
<a href="#1069" id="1069">1069</a>
<a href="#1070" id="1070">1070</a>
<a href="#1071" id="1071">1071</a>
<a href="#1072" id="1072">1072</a>
<a href="#1073" id="1073">1073</a>
<a href="#1074" id="1074">1074</a>
<a href="#1075" id="1075">1075</a>
<a href="#1076" id="1076">1076</a>
<a href="#1077" id="1077">1077</a>
<a href="#1078" id="1078">1078</a>
<a href="#1079" id="1079">1079</a>
<a href="#1080" id="1080">1080</a>
<a href="#1081" id="1081">1081</a>
<a href="#1082" id="1082">1082</a>
<a href="#1083" id="1083">1083</a>
<a href="#1084" id="1084">1084</a>
<a href="#1085" id="1085">1085</a>
<a href="#1086" id="1086">1086</a>
<a href="#1087" id="1087">1087</a>
<a href="#1088" id="1088">1088</a>
<a href="#1089" id="1089">1089</a>
<a href="#1090" id="1090">1090</a>
<a href="#1091" id="1091">1091</a>
<a href="#1092" id="1092">1092</a>
<a href="#1093" id="1093">1093</a>
<a href="#1094" id="1094">1094</a>
<a href="#1095" id="1095">1095</a>
<a href="#1096" id="1096">1096</a>
<a href="#1097" id="1097">1097</a>
<a href="#1098" id="1098">1098</a>
<a href="#1099" id="1099">1099</a>
<a href="#1100" id="1100">1100</a>
<a href="#1101" id="1101">1101</a>
<a href="#1102" id="1102">1102</a>
<a href="#1103" id="1103">1103</a>
<a href="#1104" id="1104">1104</a>
<a href="#1105" id="1105">1105</a>
<a href="#1106" id="1106">1106</a>
<a href="#1107" id="1107">1107</a>
<a href="#1108" id="1108">1108</a>
<a href="#1109" id="1109">1109</a>
<a href="#1110" id="1110">1110</a>
<a href="#1111" id="1111">1111</a>
<a href="#1112" id="1112">1112</a>
<a href="#1113" id="1113">1113</a>
<a href="#1114" id="1114">1114</a>
<a href="#1115" id="1115">1115</a>
<a href="#1116" id="1116">1116</a>
<a href="#1117" id="1117">1117</a>
<a href="#1118" id="1118">1118</a>
<a href="#1119" id="1119">1119</a>
<a href="#1120" id="1120">1120</a>
<a href="#1121" id="1121">1121</a>
<a href="#1122" id="1122">1122</a>
<a href="#1123" id="1123">1123</a>
<a href="#1124" id="1124">1124</a>
<a href="#1125" id="1125">1125</a>
<a href="#1126" id="1126">1126</a>
<a href="#1127" id="1127">1127</a>
<a href="#1128" id="1128">1128</a>
<a href="#1129" id="1129">1129</a>
<a href="#1130" id="1130">1130</a>
<a href="#1131" id="1131">1131</a>
<a href="#1132" id="1132">1132</a>
<a href="#1133" id="1133">1133</a>
<a href="#1134" id="1134">1134</a>
<a href="#1135" id="1135">1135</a>
<a href="#1136" id="1136">1136</a>
<a href="#1137" id="1137">1137</a>
<a href="#1138" id="1138">1138</a>
<a href="#1139" id="1139">1139</a>
<a href="#1140" id="1140">1140</a>
<a href="#1141" id="1141">1141</a>
<a href="#1142" id="1142">1142</a>
<a href="#1143" id="1143">1143</a>
<a href="#1144" id="1144">1144</a>
<a href="#1145" id="1145">1145</a>
<a href="#1146" id="1146">1146</a>
<a href="#1147" id="1147">1147</a>
<a href="#1148" id="1148">1148</a>
<a href="#1149" id="1149">1149</a>
<a href="#1150" id="1150">1150</a>
<a href="#1151" id="1151">1151</a>
<a href="#1152" id="1152">1152</a>
<a href="#1153" id="1153">1153</a>
<a href="#1154" id="1154">1154</a>
<a href="#1155" id="1155">1155</a>
<a href="#1156" id="1156">1156</a>
<a href="#1157" id="1157">1157</a>
<a href="#1158" id="1158">1158</a>
<a href="#1159" id="1159">1159</a>
<a href="#1160" id="1160">1160</a>
<a href="#1161" id="1161">1161</a>
<a href="#1162" id="1162">1162</a>
<a href="#1163" id="1163">1163</a>
<a href="#1164" id="1164">1164</a>
<a href="#1165" id="1165">1165</a>
<a href="#1166" id="1166">1166</a>
<a href="#1167" id="1167">1167</a>
<a href="#1168" id="1168">1168</a>
<a href="#1169" id="1169">1169</a>
<a href="#1170" id="1170">1170</a>
<a href="#1171" id="1171">1171</a>
<a href="#1172" id="1172">1172</a>
<a href="#1173" id="1173">1173</a>
<a href="#1174" id="1174">1174</a>
<a href="#1175" id="1175">1175</a>
<a href="#1176" id="1176">1176</a>
<a href="#1177" id="1177">1177</a>
<a href="#1178" id="1178">1178</a>
<a href="#1179" id="1179">1179</a>
<a href="#1180" id="1180">1180</a>
<a href="#1181" id="1181">1181</a>
<a href="#1182" id="1182">1182</a>
<a href="#1183" id="1183">1183</a>
<a href="#1184" id="1184">1184</a>
<a href="#1185" id="1185">1185</a>
<a href="#1186" id="1186">1186</a>
<a href="#1187" id="1187">1187</a>
<a href="#1188" id="1188">1188</a>
<a href="#1189" id="1189">1189</a>
<a href="#1190" id="1190">1190</a>
<a href="#1191" id="1191">1191</a>
<a href="#1192" id="1192">1192</a>
<a href="#1193" id="1193">1193</a>
<a href="#1194" id="1194">1194</a>
<a href="#1195" id="1195">1195</a>
<a href="#1196" id="1196">1196</a>
<a href="#1197" id="1197">1197</a>
<a href="#1198" id="1198">1198</a>
<a href="#1199" id="1199">1199</a>
<a href="#1200" id="1200">1200</a>
<a href="#1201" id="1201">1201</a>
<a href="#1202" id="1202">1202</a>
<a href="#1203" id="1203">1203</a>
<a href="#1204" id="1204">1204</a>
<a href="#1205" id="1205">1205</a>
<a href="#1206" id="1206">1206</a>
<a href="#1207" id="1207">1207</a>
<a href="#1208" id="1208">1208</a>
<a href="#1209" id="1209">1209</a>
<a href="#1210" id="1210">1210</a>
<a href="#1211" id="1211">1211</a>
<a href="#1212" id="1212">1212</a>
<a href="#1213" id="1213">1213</a>
<a href="#1214" id="1214">1214</a>
<a href="#1215" id="1215">1215</a>
<a href="#1216" id="1216">1216</a>
<a href="#1217" id="1217">1217</a>
<a href="#1218" id="1218">1218</a>
<a href="#1219" id="1219">1219</a>
<a href="#1220" id="1220">1220</a>
<a href="#1221" id="1221">1221</a>
<a href="#1222" id="1222">1222</a>
<a href="#1223" id="1223">1223</a>
<a href="#1224" id="1224">1224</a>
<a href="#1225" id="1225">1225</a>
<a href="#1226" id="1226">1226</a>
<a href="#1227" id="1227">1227</a>
<a href="#1228" id="1228">1228</a>
<a href="#1229" id="1229">1229</a>
<a href="#1230" id="1230">1230</a>
<a href="#1231" id="1231">1231</a>
<a href="#1232" id="1232">1232</a>
<a href="#1233" id="1233">1233</a>
<a href="#1234" id="1234">1234</a>
<a href="#1235" id="1235">1235</a>
<a href="#1236" id="1236">1236</a>
<a href="#1237" id="1237">1237</a>
<a href="#1238" id="1238">1238</a>
<a href="#1239" id="1239">1239</a>
<a href="#1240" id="1240">1240</a>
<a href="#1241" id="1241">1241</a>
<a href="#1242" id="1242">1242</a>
<a href="#1243" id="1243">1243</a>
<a href="#1244" id="1244">1244</a>
<a href="#1245" id="1245">1245</a>
<a href="#1246" id="1246">1246</a>
<a href="#1247" id="1247">1247</a>
<a href="#1248" id="1248">1248</a>
<a href="#1249" id="1249">1249</a>
<a href="#1250" id="1250">1250</a>
<a href="#1251" id="1251">1251</a>
<a href="#1252" id="1252">1252</a>
<a href="#1253" id="1253">1253</a>
<a href="#1254" id="1254">1254</a>
<a href="#1255" id="1255">1255</a>
<a href="#1256" id="1256">1256</a>
<a href="#1257" id="1257">1257</a>
<a href="#1258" id="1258">1258</a>
<a href="#1259" id="1259">1259</a>
<a href="#1260" id="1260">1260</a>
<a href="#1261" id="1261">1261</a>
<a href="#1262" id="1262">1262</a>
<a href="#1263" id="1263">1263</a>
<a href="#1264" id="1264">1264</a>
<a href="#1265" id="1265">1265</a>
<a href="#1266" id="1266">1266</a>
<a href="#1267" id="1267">1267</a>
<a href="#1268" id="1268">1268</a>
<a href="#1269" id="1269">1269</a>
<a href="#1270" id="1270">1270</a>
<a href="#1271" id="1271">1271</a>
<a href="#1272" id="1272">1272</a>
<a href="#1273" id="1273">1273</a>
<a href="#1274" id="1274">1274</a>
<a href="#1275" id="1275">1275</a>
<a href="#1276" id="1276">1276</a>
<a href="#1277" id="1277">1277</a>
<a href="#1278" id="1278">1278</a>
<a href="#1279" id="1279">1279</a>
<a href="#1280" id="1280">1280</a>
<a href="#1281" id="1281">1281</a>
<a href="#1282" id="1282">1282</a>
<a href="#1283" id="1283">1283</a>
<a href="#1284" id="1284">1284</a>
<a href="#1285" id="1285">1285</a>
<a href="#1286" id="1286">1286</a>
<a href="#1287" id="1287">1287</a>
<a href="#1288" id="1288">1288</a>
<a href="#1289" id="1289">1289</a>
<a href="#1290" id="1290">1290</a>
<a href="#1291" id="1291">1291</a>
<a href="#1292" id="1292">1292</a>
<a href="#1293" id="1293">1293</a>
<a href="#1294" id="1294">1294</a>
<a href="#1295" id="1295">1295</a>
<a href="#1296" id="1296">1296</a>
<a href="#1297" id="1297">1297</a>
<a href="#1298" id="1298">1298</a>
<a href="#1299" id="1299">1299</a>
<a href="#1300" id="1300">1300</a>
<a href="#1301" id="1301">1301</a>
<a href="#1302" id="1302">1302</a>
<a href="#1303" id="1303">1303</a>
<a href="#1304" id="1304">1304</a>
<a href="#1305" id="1305">1305</a>
<a href="#1306" id="1306">1306</a>
<a href="#1307" id="1307">1307</a>
<a href="#1308" id="1308">1308</a>
<a href="#1309" id="1309">1309</a>
<a href="#1310" id="1310">1310</a>
<a href="#1311" id="1311">1311</a>
<a href="#1312" id="1312">1312</a>
<a href="#1313" id="1313">1313</a>
<a href="#1314" id="1314">1314</a>
<a href="#1315" id="1315">1315</a>
<a href="#1316" id="1316">1316</a>
<a href="#1317" id="1317">1317</a>
<a href="#1318" id="1318">1318</a>
<a href="#1319" id="1319">1319</a>
<a href="#1320" id="1320">1320</a>
<a href="#1321" id="1321">1321</a>
<a href="#1322" id="1322">1322</a>
<a href="#1323" id="1323">1323</a>
<a href="#1324" id="1324">1324</a>
<a href="#1325" id="1325">1325</a>
<a href="#1326" id="1326">1326</a>
<a href="#1327" id="1327">1327</a>
<a href="#1328" id="1328">1328</a>
<a href="#1329" id="1329">1329</a>
<a href="#1330" id="1330">1330</a>
<a href="#1331" id="1331">1331</a>
<a href="#1332" id="1332">1332</a>
<a href="#1333" id="1333">1333</a>
<a href="#1334" id="1334">1334</a>
<a href="#1335" id="1335">1335</a>
<a href="#1336" id="1336">1336</a>
<a href="#1337" id="1337">1337</a>
<a href="#1338" id="1338">1338</a>
<a href="#1339" id="1339">1339</a>
<a href="#1340" id="1340">1340</a>
<a href="#1341" id="1341">1341</a>
<a href="#1342" id="1342">1342</a>
<a href="#1343" id="1343">1343</a>
<a href="#1344" id="1344">1344</a>
<a href="#1345" id="1345">1345</a>
<a href="#1346" id="1346">1346</a>
<a href="#1347" id="1347">1347</a>
<a href="#1348" id="1348">1348</a>
<a href="#1349" id="1349">1349</a>
<a href="#1350" id="1350">1350</a>
<a href="#1351" id="1351">1351</a>
<a href="#1352" id="1352">1352</a>
<a href="#1353" id="1353">1353</a>
<a href="#1354" id="1354">1354</a>
<a href="#1355" id="1355">1355</a>
<a href="#1356" id="1356">1356</a>
<a href="#1357" id="1357">1357</a>
<a href="#1358" id="1358">1358</a>
<a href="#1359" id="1359">1359</a>
<a href="#1360" id="1360">1360</a>
<a href="#1361" id="1361">1361</a>
<a href="#1362" id="1362">1362</a>
<a href="#1363" id="1363">1363</a>
<a href="#1364" id="1364">1364</a>
<a href="#1365" id="1365">1365</a>
<a href="#1366" id="1366">1366</a>
<a href="#1367" id="1367">1367</a>
<a href="#1368" id="1368">1368</a>
<a href="#1369" id="1369">1369</a>
<a href="#1370" id="1370">1370</a>
<a href="#1371" id="1371">1371</a>
<a href="#1372" id="1372">1372</a>
<a href="#1373" id="1373">1373</a>
<a href="#1374" id="1374">1374</a>
<a href="#1375" id="1375">1375</a>
<a href="#1376" id="1376">1376</a>
<a href="#1377" id="1377">1377</a>
<a href="#1378" id="1378">1378</a>
<a href="#1379" id="1379">1379</a>
<a href="#1380" id="1380">1380</a>
<a href="#1381" id="1381">1381</a>
<a href="#1382" id="1382">1382</a>
<a href="#1383" id="1383">1383</a>
<a href="#1384" id="1384">1384</a>
<a href="#1385" id="1385">1385</a>
<a href="#1386" id="1386">1386</a>
<a href="#1387" id="1387">1387</a>
<a href="#1388" id="1388">1388</a>
<a href="#1389" id="1389">1389</a>
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<a href="#1600" id="1600">1600</a></pre></div><pre class="rust"><code><span class="kw">use </span>core::{
    cmp::Ordering, convert::TryFrom, fmt, hash, iter::FromIterator, mem::MaybeUninit, ops, ptr,
    slice,
};
<span class="kw">use </span>hash32;

<span class="doccomment">/// A fixed capacity [`Vec`](https://doc.rust-lang.org/std/vec/struct.Vec.html)
///
/// # Examples
///
/// ```
/// use heapless::Vec;
///
///
/// // A vector with a fixed capacity of 8 elements allocated on the stack
/// let mut vec = Vec::&lt;_, 8&gt;::new();
/// vec.push(1);
/// vec.push(2);
///
/// assert_eq!(vec.len(), 2);
/// assert_eq!(vec[0], 1);
///
/// assert_eq!(vec.pop(), Some(2));
/// assert_eq!(vec.len(), 1);
///
/// vec[0] = 7;
/// assert_eq!(vec[0], 7);
///
/// vec.extend([1, 2, 3].iter().cloned());
///
/// for x in &amp;vec {
///     println!("{}", x);
/// }
/// assert_eq!(*vec, [7, 1, 2, 3]);
/// ```
</span><span class="kw">pub struct </span>Vec&lt;T, <span class="kw">const </span>N: usize&gt; {
    <span class="comment">// NOTE order is important for optimizations. the `len` first layout lets the compiler optimize
    // `new` to: reserve stack space and zero the first word. With the fields in the reverse order
    // the compiler optimizes `new` to `memclr`-ing the *entire* stack space, including the `buffer`
    // field which should be left uninitialized. Optimizations were last checked with Rust 1.60
    </span>len: usize,

    buffer: [MaybeUninit&lt;T&gt;; N],
}

<span class="kw">impl</span>&lt;T, <span class="kw">const </span>N: usize&gt; Vec&lt;T, N&gt; {
    <span class="kw">const </span>ELEM: MaybeUninit&lt;T&gt; = MaybeUninit::uninit();
    <span class="kw">const </span>INIT: [MaybeUninit&lt;T&gt;; N] = [<span class="self">Self</span>::ELEM; N]; <span class="comment">// important for optimization of `new`

    </span><span class="doccomment">/// Constructs a new, empty vector with a fixed capacity of `N`
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::Vec;
    ///
    /// // allocate the vector on the stack
    /// let mut x: Vec&lt;u8, 16&gt; = Vec::new();
    ///
    /// // allocate the vector in a static variable
    /// static mut X: Vec&lt;u8, 16&gt; = Vec::new();
    /// ```
    /// `Vec` `const` constructor; wrap the returned value in [`Vec`](../struct.Vec.html)
    </span><span class="kw">pub const fn </span>new() -&gt; <span class="self">Self </span>{
        <span class="comment">// Const assert N &gt;= 0
        </span><span class="kw">crate</span>::sealed::greater_than_eq_0::&lt;N&gt;();

        <span class="self">Self </span>{
            len: <span class="number">0</span>,
            buffer: <span class="self">Self</span>::INIT,
        }
    }

    <span class="doccomment">/// Constructs a new vector with a fixed capacity of `N` and fills it
    /// with the provided slice.
    ///
    /// This is equivalent to the following code:
    ///
    /// ```
    /// use heapless::Vec;
    ///
    /// let mut v: Vec&lt;u8, 16&gt; = Vec::new();
    /// v.extend_from_slice(&amp;[1, 2, 3]).unwrap();
    /// ```
    </span><span class="attr">#[inline]
    </span><span class="kw">pub fn </span>from_slice(other: <span class="kw-2">&amp;</span>[T]) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, ()&gt;
    <span class="kw">where
        </span>T: Clone,
    {
        <span class="kw">let </span><span class="kw-2">mut </span>v = Vec::new();
        v.extend_from_slice(other)<span class="question-mark">?</span>;
        <span class="prelude-val">Ok</span>(v)
    }

    <span class="doccomment">/// Clones a vec into a new vec
    </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>clone(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self
    </span><span class="kw">where
        </span>T: Clone,
    {
        <span class="kw">let </span><span class="kw-2">mut </span>new = <span class="self">Self</span>::new();
        <span class="comment">// avoid `extend_from_slice` as that introduces a runtime check / panicking branch
        </span><span class="kw">for </span>elem <span class="kw">in </span><span class="self">self </span>{
            <span class="kw">unsafe </span>{
                new.push_unchecked(elem.clone());
            }
        }
        new
    }

    <span class="doccomment">/// Returns a raw pointer to the vector’s buffer.
    </span><span class="kw">pub fn </span>as_ptr(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">*const </span>T {
        <span class="self">self</span>.buffer.as_ptr() <span class="kw">as </span><span class="kw-2">*const </span>T
    }

    <span class="doccomment">/// Returns a raw pointer to the vector’s buffer, which may be mutated through.
    </span><span class="kw">pub fn </span>as_mut_ptr(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">*mut </span>T {
        <span class="self">self</span>.buffer.as_mut_ptr() <span class="kw">as </span><span class="kw-2">*mut </span>T
    }

    <span class="doccomment">/// Extracts a slice containing the entire vector.
    ///
    /// Equivalent to `&amp;s[..]`.
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::Vec;
    /// let buffer: Vec&lt;u8, 5&gt; = Vec::from_slice(&amp;[1, 2, 3, 5, 8]).unwrap();
    /// assert_eq!(buffer.as_slice(), &amp;[1, 2, 3, 5, 8]);
    /// ```
    </span><span class="kw">pub fn </span>as_slice(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>[T] {
        <span class="comment">// NOTE(unsafe) avoid bound checks in the slicing operation
        // &amp;buffer[..self.len]
        </span><span class="kw">unsafe </span>{ slice::from_raw_parts(<span class="self">self</span>.buffer.as_ptr() <span class="kw">as </span><span class="kw-2">*const </span>T, <span class="self">self</span>.len) }
    }

    <span class="doccomment">/// Returns the contents of the vector as an array of length `M` if the length
    /// of the vector is exactly `M`, otherwise returns `Err(self)`.
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::Vec;
    /// let buffer: Vec&lt;u8, 42&gt; = Vec::from_slice(&amp;[1, 2, 3, 5, 8]).unwrap();
    /// let array: [u8; 5] = buffer.into_array().unwrap();
    /// assert_eq!(array, [1, 2, 3, 5, 8]);
    /// ```
    </span><span class="kw">pub fn </span>into_array&lt;<span class="kw">const </span>M: usize&gt;(<span class="self">self</span>) -&gt; <span class="prelude-ty">Result</span>&lt;[T; M], <span class="self">Self</span>&gt; {
        <span class="kw">if </span><span class="self">self</span>.len() == M {
            <span class="comment">// This is how the unstable `MaybeUninit::array_assume_init` method does it
            </span><span class="kw">let </span>array = <span class="kw">unsafe </span>{ (<span class="kw-2">&amp;</span><span class="self">self</span>.buffer <span class="kw">as </span><span class="kw-2">*const </span><span class="kw">_ as </span><span class="kw-2">*const </span>[T; M]).read() };

            <span class="comment">// We don't want `self`'s destructor to be called because that would drop all the
            // items in the array
            </span>core::mem::forget(<span class="self">self</span>);

            <span class="prelude-val">Ok</span>(array)
        } <span class="kw">else </span>{
            <span class="prelude-val">Err</span>(<span class="self">self</span>)
        }
    }

    <span class="doccomment">/// Extracts a mutable slice containing the entire vector.
    ///
    /// Equivalent to `&amp;s[..]`.
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::Vec;
    /// let mut buffer: Vec&lt;u8, 5&gt; = Vec::from_slice(&amp;[1, 2, 3, 5, 8]).unwrap();
    /// buffer[0] = 9;
    /// assert_eq!(buffer.as_slice(), &amp;[9, 2, 3, 5, 8]);
    /// ```
    </span><span class="kw">pub</span>(<span class="kw">crate</span>) <span class="kw">fn </span>as_mut_slice(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>[T] {
        <span class="comment">// NOTE(unsafe) avoid bound checks in the slicing operation
        // &amp;mut buffer[..self.len]
        </span><span class="kw">unsafe </span>{ slice::from_raw_parts_mut(<span class="self">self</span>.buffer.as_mut_ptr() <span class="kw">as </span><span class="kw-2">*mut </span>T, <span class="self">self</span>.len) }
    }

    <span class="doccomment">/// Returns the maximum number of elements the vector can hold.
    </span><span class="kw">pub const fn </span>capacity(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; usize {
        N
    }

    <span class="doccomment">/// Clears the vector, removing all values.
    </span><span class="kw">pub fn </span>clear(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
        <span class="self">self</span>.truncate(<span class="number">0</span>);
    }

    <span class="doccomment">/// Extends the vec from an iterator.
    ///
    /// # Panic
    ///
    /// Panics if the vec cannot hold all elements of the iterator.
    </span><span class="kw">pub fn </span>extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, iter: I)
    <span class="kw">where
        </span>I: IntoIterator&lt;Item = T&gt;,
    {
        <span class="kw">for </span>elem <span class="kw">in </span>iter {
            <span class="self">self</span>.push(elem).ok().unwrap()
        }
    }

    <span class="doccomment">/// Clones and appends all elements in a slice to the `Vec`.
    ///
    /// Iterates over the slice `other`, clones each element, and then appends
    /// it to this `Vec`. The `other` vector is traversed in-order.
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::Vec;
    ///
    /// let mut vec = Vec::&lt;u8, 8&gt;::new();
    /// vec.push(1).unwrap();
    /// vec.extend_from_slice(&amp;[2, 3, 4]).unwrap();
    /// assert_eq!(*vec, [1, 2, 3, 4]);
    /// ```
    </span><span class="kw">pub fn </span>extend_from_slice(<span class="kw-2">&amp;mut </span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>[T]) -&gt; <span class="prelude-ty">Result</span>&lt;(), ()&gt;
    <span class="kw">where
        </span>T: Clone,
    {
        <span class="kw">if </span><span class="self">self</span>.len + other.len() &gt; <span class="self">self</span>.capacity() {
            <span class="comment">// won't fit in the `Vec`; don't modify anything and return an error
            </span><span class="prelude-val">Err</span>(())
        } <span class="kw">else </span>{
            <span class="kw">for </span>elem <span class="kw">in </span>other {
                <span class="kw">unsafe </span>{
                    <span class="self">self</span>.push_unchecked(elem.clone());
                }
            }
            <span class="prelude-val">Ok</span>(())
        }
    }

    <span class="doccomment">/// Removes the last element from a vector and returns it, or `None` if it's empty
    </span><span class="kw">pub fn </span>pop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;T&gt; {
        <span class="kw">if </span><span class="self">self</span>.len != <span class="number">0 </span>{
            <span class="prelude-val">Some</span>(<span class="kw">unsafe </span>{ <span class="self">self</span>.pop_unchecked() })
        } <span class="kw">else </span>{
            <span class="prelude-val">None
        </span>}
    }

    <span class="doccomment">/// Appends an `item` to the back of the collection
    ///
    /// Returns back the `item` if the vector is full
    </span><span class="kw">pub fn </span>push(<span class="kw-2">&amp;mut </span><span class="self">self</span>, item: T) -&gt; <span class="prelude-ty">Result</span>&lt;(), T&gt; {
        <span class="kw">if </span><span class="self">self</span>.len &lt; <span class="self">self</span>.capacity() {
            <span class="kw">unsafe </span>{ <span class="self">self</span>.push_unchecked(item) }
            <span class="prelude-val">Ok</span>(())
        } <span class="kw">else </span>{
            <span class="prelude-val">Err</span>(item)
        }
    }

    <span class="doccomment">/// Removes the last element from a vector and returns it
    ///
    /// # Safety
    ///
    /// This assumes the vec to have at least one element.
    </span><span class="kw">pub unsafe fn </span>pop_unchecked(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; T {
        <span class="macro">debug_assert!</span>(!<span class="self">self</span>.is_empty());

        <span class="self">self</span>.len -= <span class="number">1</span>;
        (<span class="self">self</span>.buffer.get_unchecked_mut(<span class="self">self</span>.len).as_ptr() <span class="kw">as </span><span class="kw-2">*const </span>T).read()
    }

    <span class="doccomment">/// Appends an `item` to the back of the collection
    ///
    /// # Safety
    ///
    /// This assumes the vec is not full.
    </span><span class="kw">pub unsafe fn </span>push_unchecked(<span class="kw-2">&amp;mut </span><span class="self">self</span>, item: T) {
        <span class="comment">// NOTE(ptr::write) the memory slot that we are about to write to is uninitialized. We
        // use `ptr::write` to avoid running `T`'s destructor on the uninitialized memory
        </span><span class="macro">debug_assert!</span>(!<span class="self">self</span>.is_full());

        <span class="kw-2">*</span><span class="self">self</span>.buffer.get_unchecked_mut(<span class="self">self</span>.len) = MaybeUninit::new(item);

        <span class="self">self</span>.len += <span class="number">1</span>;
    }

    <span class="doccomment">/// Shortens the vector, keeping the first `len` elements and dropping the rest.
    </span><span class="kw">pub fn </span>truncate(<span class="kw-2">&amp;mut </span><span class="self">self</span>, len: usize) {
        <span class="comment">// This is safe because:
        //
        // * the slice passed to `drop_in_place` is valid; the `len &gt; self.len`
        //   case avoids creating an invalid slice, and
        // * the `len` of the vector is shrunk before calling `drop_in_place`,
        //   such that no value will be dropped twice in case `drop_in_place`
        //   were to panic once (if it panics twice, the program aborts).
        </span><span class="kw">unsafe </span>{
            <span class="comment">// Note: It's intentional that this is `&gt;` and not `&gt;=`.
            //       Changing it to `&gt;=` has negative performance
            //       implications in some cases. See rust-lang/rust#78884 for more.
            </span><span class="kw">if </span>len &gt; <span class="self">self</span>.len {
                <span class="kw">return</span>;
            }
            <span class="kw">let </span>remaining_len = <span class="self">self</span>.len - len;
            <span class="kw">let </span>s = ptr::slice_from_raw_parts_mut(<span class="self">self</span>.as_mut_ptr().add(len), remaining_len);
            <span class="self">self</span>.len = len;
            ptr::drop_in_place(s);
        }
    }

    <span class="doccomment">/// Resizes the Vec in-place so that len is equal to new_len.
    ///
    /// If new_len is greater than len, the Vec is extended by the
    /// difference, with each additional slot filled with value. If
    /// new_len is less than len, the Vec is simply truncated.
    ///
    /// See also [`resize_default`](struct.Vec.html#method.resize_default).
    </span><span class="kw">pub fn </span>resize(<span class="kw-2">&amp;mut </span><span class="self">self</span>, new_len: usize, value: T) -&gt; <span class="prelude-ty">Result</span>&lt;(), ()&gt;
    <span class="kw">where
        </span>T: Clone,
    {
        <span class="kw">if </span>new_len &gt; <span class="self">self</span>.capacity() {
            <span class="kw">return </span><span class="prelude-val">Err</span>(());
        }

        <span class="kw">if </span>new_len &gt; <span class="self">self</span>.len {
            <span class="kw">while </span><span class="self">self</span>.len &lt; new_len {
                <span class="self">self</span>.push(value.clone()).ok();
            }
        } <span class="kw">else </span>{
            <span class="self">self</span>.truncate(new_len);
        }

        <span class="prelude-val">Ok</span>(())
    }

    <span class="doccomment">/// Resizes the `Vec` in-place so that `len` is equal to `new_len`.
    ///
    /// If `new_len` is greater than `len`, the `Vec` is extended by the
    /// difference, with each additional slot filled with `Default::default()`.
    /// If `new_len` is less than `len`, the `Vec` is simply truncated.
    ///
    /// See also [`resize`](struct.Vec.html#method.resize).
    </span><span class="kw">pub fn </span>resize_default(<span class="kw-2">&amp;mut </span><span class="self">self</span>, new_len: usize) -&gt; <span class="prelude-ty">Result</span>&lt;(), ()&gt;
    <span class="kw">where
        </span>T: Clone + Default,
    {
        <span class="self">self</span>.resize(new_len, T::default())
    }

    <span class="doccomment">/// Forces the length of the vector to `new_len`.
    ///
    /// This is a low-level operation that maintains none of the normal
    /// invariants of the type. Normally changing the length of a vector
    /// is done using one of the safe operations instead, such as
    /// [`truncate`], [`resize`], [`extend`], or [`clear`].
    ///
    /// [`truncate`]: #method.truncate
    /// [`resize`]: #method.resize
    /// [`extend`]: https://doc.rust-lang.org/stable/core/iter/trait.Extend.html#tymethod.extend
    /// [`clear`]: #method.clear
    ///
    /// # Safety
    ///
    /// - `new_len` must be less than or equal to [`capacity()`].
    /// - The elements at `old_len..new_len` must be initialized.
    ///
    /// [`capacity()`]: #method.capacity
    ///
    /// # Examples
    ///
    /// This method can be useful for situations in which the vector
    /// is serving as a buffer for other code, particularly over FFI:
    ///
    /// ```no_run
    /// # #![allow(dead_code)]
    /// use heapless::Vec;
    ///
    /// # // This is just a minimal skeleton for the doc example;
    /// # // don't use this as a starting point for a real library.
    /// # pub struct StreamWrapper { strm: *mut core::ffi::c_void }
    /// # const Z_OK: i32 = 0;
    /// # extern "C" {
    /// #     fn deflateGetDictionary(
    /// #         strm: *mut core::ffi::c_void,
    /// #         dictionary: *mut u8,
    /// #         dictLength: *mut usize,
    /// #     ) -&gt; i32;
    /// # }
    /// # impl StreamWrapper {
    /// pub fn get_dictionary(&amp;self) -&gt; Option&lt;Vec&lt;u8, 32768&gt;&gt; {
    ///     // Per the FFI method's docs, "32768 bytes is always enough".
    ///     let mut dict = Vec::new();
    ///     let mut dict_length = 0;
    ///     // SAFETY: When `deflateGetDictionary` returns `Z_OK`, it holds that:
    ///     // 1. `dict_length` elements were initialized.
    ///     // 2. `dict_length` &lt;= the capacity (32_768)
    ///     // which makes `set_len` safe to call.
    ///     unsafe {
    ///         // Make the FFI call...
    ///         let r = deflateGetDictionary(self.strm, dict.as_mut_ptr(), &amp;mut dict_length);
    ///         if r == Z_OK {
    ///             // ...and update the length to what was initialized.
    ///             dict.set_len(dict_length);
    ///             Some(dict)
    ///         } else {
    ///             None
    ///         }
    ///     }
    /// }
    /// # }
    /// ```
    ///
    /// While the following example is sound, there is a memory leak since
    /// the inner vectors were not freed prior to the `set_len` call:
    ///
    /// ```
    /// use core::iter::FromIterator;
    /// use heapless::Vec;
    ///
    /// let mut vec = Vec::&lt;Vec&lt;u8, 3&gt;, 3&gt;::from_iter(
    ///     [
    ///         Vec::from_iter([1, 0, 0].iter().cloned()),
    ///         Vec::from_iter([0, 1, 0].iter().cloned()),
    ///         Vec::from_iter([0, 0, 1].iter().cloned()),
    ///     ]
    ///     .iter()
    ///     .cloned()
    /// );
    /// // SAFETY:
    /// // 1. `old_len..0` is empty so no elements need to be initialized.
    /// // 2. `0 &lt;= capacity` always holds whatever `capacity` is.
    /// unsafe {
    ///     vec.set_len(0);
    /// }
    /// ```
    ///
    /// Normally, here, one would use [`clear`] instead to correctly drop
    /// the contents and thus not leak memory.
    </span><span class="kw">pub unsafe fn </span>set_len(<span class="kw-2">&amp;mut </span><span class="self">self</span>, new_len: usize) {
        <span class="macro">debug_assert!</span>(new_len &lt;= <span class="self">self</span>.capacity());

        <span class="self">self</span>.len = new_len
    }

    <span class="doccomment">/// Removes an element from the vector and returns it.
    ///
    /// The removed element is replaced by the last element of the vector.
    ///
    /// This does not preserve ordering, but is O(1).
    ///
    /// # Panics
    ///
    /// Panics if `index` is out of bounds.
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::Vec;
    </span><span class="comment">///// use heapless::consts::*;
    </span><span class="doccomment">///
    /// let mut v: Vec&lt;_, 8&gt; = Vec::new();
    /// v.push("foo").unwrap();
    /// v.push("bar").unwrap();
    /// v.push("baz").unwrap();
    /// v.push("qux").unwrap();
    ///
    /// assert_eq!(v.swap_remove(1), "bar");
    /// assert_eq!(&amp;*v, ["foo", "qux", "baz"]);
    ///
    /// assert_eq!(v.swap_remove(0), "foo");
    /// assert_eq!(&amp;*v, ["baz", "qux"]);
    /// ```
    </span><span class="kw">pub fn </span>swap_remove(<span class="kw-2">&amp;mut </span><span class="self">self</span>, index: usize) -&gt; T {
        <span class="macro">assert!</span>(index &lt; <span class="self">self</span>.len);
        <span class="kw">unsafe </span>{ <span class="self">self</span>.swap_remove_unchecked(index) }
    }

    <span class="doccomment">/// Removes an element from the vector and returns it.
    ///
    /// The removed element is replaced by the last element of the vector.
    ///
    /// This does not preserve ordering, but is O(1).
    ///
    /// # Safety
    ///
    ///  Assumes `index` within bounds.
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::Vec;
    ///
    /// let mut v: Vec&lt;_, 8&gt; = Vec::new();
    /// v.push("foo").unwrap();
    /// v.push("bar").unwrap();
    /// v.push("baz").unwrap();
    /// v.push("qux").unwrap();
    ///
    /// assert_eq!(unsafe { v.swap_remove_unchecked(1) }, "bar");
    /// assert_eq!(&amp;*v, ["foo", "qux", "baz"]);
    ///
    /// assert_eq!(unsafe { v.swap_remove_unchecked(0) }, "foo");
    /// assert_eq!(&amp;*v, ["baz", "qux"]);
    /// ```
    </span><span class="kw">pub unsafe fn </span>swap_remove_unchecked(<span class="kw-2">&amp;mut </span><span class="self">self</span>, index: usize) -&gt; T {
        <span class="kw">let </span>length = <span class="self">self</span>.len();
        <span class="macro">debug_assert!</span>(index &lt; length);
        <span class="kw">let </span>value = ptr::read(<span class="self">self</span>.as_ptr().add(index));
        <span class="kw">let </span>base_ptr = <span class="self">self</span>.as_mut_ptr();
        ptr::copy(base_ptr.add(length - <span class="number">1</span>), base_ptr.add(index), <span class="number">1</span>);
        <span class="self">self</span>.len -= <span class="number">1</span>;
        value
    }

    <span class="doccomment">/// Returns true if the vec is full
    </span><span class="attr">#[inline]
    </span><span class="kw">pub fn </span>is_full(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
        <span class="self">self</span>.len == <span class="self">self</span>.capacity()
    }

    <span class="doccomment">/// Returns true if the vec is empty
    </span><span class="attr">#[inline]
    </span><span class="kw">pub fn </span>is_empty(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; bool {
        <span class="self">self</span>.len == <span class="number">0
    </span>}

    <span class="doccomment">/// Returns `true` if `needle` is a prefix of the Vec.
    ///
    /// Always returns `true` if `needle` is an empty slice.
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::Vec;
    ///
    /// let v: Vec&lt;_, 8&gt; = Vec::from_slice(b"abc").unwrap();
    /// assert_eq!(v.starts_with(b""), true);
    /// assert_eq!(v.starts_with(b"ab"), true);
    /// assert_eq!(v.starts_with(b"bc"), false);
    /// ```
    </span><span class="attr">#[inline]
    </span><span class="kw">pub fn </span>starts_with(<span class="kw-2">&amp;</span><span class="self">self</span>, needle: <span class="kw-2">&amp;</span>[T]) -&gt; bool
    <span class="kw">where
        </span>T: PartialEq,
    {
        <span class="kw">let </span>n = needle.len();
        <span class="self">self</span>.len &gt;= n &amp;&amp; needle == <span class="kw-2">&amp;</span><span class="self">self</span>[..n]
    }

    <span class="doccomment">/// Returns `true` if `needle` is a suffix of the Vec.
    ///
    /// Always returns `true` if `needle` is an empty slice.
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::Vec;
    ///
    /// let v: Vec&lt;_, 8&gt; = Vec::from_slice(b"abc").unwrap();
    /// assert_eq!(v.ends_with(b""), true);
    /// assert_eq!(v.ends_with(b"ab"), false);
    /// assert_eq!(v.ends_with(b"bc"), true);
    /// ```
    </span><span class="attr">#[inline]
    </span><span class="kw">pub fn </span>ends_with(<span class="kw-2">&amp;</span><span class="self">self</span>, needle: <span class="kw-2">&amp;</span>[T]) -&gt; bool
    <span class="kw">where
        </span>T: PartialEq,
    {
        <span class="kw">let </span>(v, n) = (<span class="self">self</span>.len(), needle.len());
        v &gt;= n &amp;&amp; needle == <span class="kw-2">&amp;</span><span class="self">self</span>[v - n..]
    }

    <span class="doccomment">/// Inserts an element at position `index` within the vector, shifting all
    /// elements after it to the right.
    ///
    /// Returns back the `element` if the vector is full.
    ///
    /// # Panics
    ///
    /// Panics if `index &gt; len`.
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::Vec;
    ///
    /// let mut vec: Vec&lt;_, 8&gt; = Vec::from_slice(&amp;[1, 2, 3]).unwrap();
    /// vec.insert(1, 4);
    /// assert_eq!(vec, [1, 4, 2, 3]);
    /// vec.insert(4, 5);
    /// assert_eq!(vec, [1, 4, 2, 3, 5]);
    /// ```
    </span><span class="kw">pub fn </span>insert(<span class="kw-2">&amp;mut </span><span class="self">self</span>, index: usize, element: T) -&gt; <span class="prelude-ty">Result</span>&lt;(), T&gt; {
        <span class="kw">let </span>len = <span class="self">self</span>.len();
        <span class="kw">if </span>index &gt; len {
            <span class="macro">panic!</span>(
                <span class="string">"insertion index (is {}) should be &lt;= len (is {})"</span>,
                index, len
            );
        }

        <span class="comment">// check there's space for the new element
        </span><span class="kw">if </span><span class="self">self</span>.is_full() {
            <span class="kw">return </span><span class="prelude-val">Err</span>(element);
        }

        <span class="kw">unsafe </span>{
            <span class="comment">// infallible
            // The spot to put the new value
            </span>{
                <span class="kw">let </span>p = <span class="self">self</span>.as_mut_ptr().add(index);
                <span class="comment">// Shift everything over to make space. (Duplicating the
                // `index`th element into two consecutive places.)
                </span>ptr::copy(p, p.offset(<span class="number">1</span>), len - index);
                <span class="comment">// Write it in, overwriting the first copy of the `index`th
                // element.
                </span>ptr::write(p, element);
            }
            <span class="self">self</span>.set_len(len + <span class="number">1</span>);
        }

        <span class="prelude-val">Ok</span>(())
    }

    <span class="doccomment">/// Removes and returns the element at position `index` within the vector,
    /// shifting all elements after it to the left.
    ///
    /// Note: Because this shifts over the remaining elements, it has a
    /// worst-case performance of *O*(*n*). If you don't need the order of
    /// elements to be preserved, use [`swap_remove`] instead. If you'd like to
    /// remove elements from the beginning of the `Vec`, consider using
    /// [`Deque::pop_front`] instead.
    ///
    /// [`swap_remove`]: Vec::swap_remove
    /// [`Deque::pop_front`]: crate::Deque::pop_front
    ///
    /// # Panics
    ///
    /// Panics if `index` is out of bounds.
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::Vec;
    ///
    /// let mut v: Vec&lt;_, 8&gt; = Vec::from_slice(&amp;[1, 2, 3]).unwrap();
    /// assert_eq!(v.remove(1), 2);
    /// assert_eq!(v, [1, 3]);
    /// ```
    </span><span class="kw">pub fn </span>remove(<span class="kw-2">&amp;mut </span><span class="self">self</span>, index: usize) -&gt; T {
        <span class="kw">let </span>len = <span class="self">self</span>.len();
        <span class="kw">if </span>index &gt;= len {
            <span class="macro">panic!</span>(<span class="string">"removal index (is {}) should be &lt; len (is {})"</span>, index, len);
        }
        <span class="kw">unsafe </span>{
            <span class="comment">// infallible
            </span><span class="kw">let </span>ret;
            {
                <span class="comment">// the place we are taking from.
                </span><span class="kw">let </span>ptr = <span class="self">self</span>.as_mut_ptr().add(index);
                <span class="comment">// copy it out, unsafely having a copy of the value on
                // the stack and in the vector at the same time.
                </span>ret = ptr::read(ptr);

                <span class="comment">// Shift everything down to fill in that spot.
                </span>ptr::copy(ptr.offset(<span class="number">1</span>), ptr, len - index - <span class="number">1</span>);
            }
            <span class="self">self</span>.set_len(len - <span class="number">1</span>);
            ret
        }
    }

    <span class="doccomment">/// Retains only the elements specified by the predicate.
    ///
    /// In other words, remove all elements `e` for which `f(&amp;e)` returns `false`.
    /// This method operates in place, visiting each element exactly once in the
    /// original order, and preserves the order of the retained elements.
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::Vec;
    ///
    /// let mut vec: Vec&lt;_, 8&gt; = Vec::from_slice(&amp;[1, 2, 3, 4]).unwrap();
    /// vec.retain(|&amp;x| x % 2 == 0);
    /// assert_eq!(vec, [2, 4]);
    /// ```
    ///
    /// Because the elements are visited exactly once in the original order,
    /// external state may be used to decide which elements to keep.
    ///
    /// ```
    /// use heapless::Vec;
    ///
    /// let mut vec: Vec&lt;_, 8&gt; = Vec::from_slice(&amp;[1, 2, 3, 4, 5]).unwrap();
    /// let keep = [false, true, true, false, true];
    /// let mut iter = keep.iter();
    /// vec.retain(|_| *iter.next().unwrap());
    /// assert_eq!(vec, [2, 3, 5]);
    /// ```
    </span><span class="kw">pub fn </span>retain&lt;F&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, <span class="kw-2">mut </span>f: F)
    <span class="kw">where
        </span>F: FnMut(<span class="kw-2">&amp;</span>T) -&gt; bool,
    {
        <span class="self">self</span>.retain_mut(|elem| f(elem));
    }

    <span class="doccomment">/// Retains only the elements specified by the predicate, passing a mutable reference to it.
    ///
    /// In other words, remove all elements `e` such that `f(&amp;mut e)` returns `false`.
    /// This method operates in place, visiting each element exactly once in the
    /// original order, and preserves the order of the retained elements.
    ///
    /// # Examples
    ///
    /// ```
    /// use heapless::Vec;
    ///
    /// let mut vec: Vec&lt;_, 8&gt; = Vec::from_slice(&amp;[1, 2, 3, 4]).unwrap();
    /// vec.retain_mut(|x| if *x &lt;= 3 {
    ///     *x += 1;
    ///     true
    /// } else {
    ///     false
    /// });
    /// assert_eq!(vec, [2, 3, 4]);
    /// ```
    </span><span class="kw">pub fn </span>retain_mut&lt;F&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, <span class="kw-2">mut </span>f: F)
    <span class="kw">where
        </span>F: FnMut(<span class="kw-2">&amp;mut </span>T) -&gt; bool,
    {
        <span class="kw">let </span>original_len = <span class="self">self</span>.len();
        <span class="comment">// Avoid double drop if the drop guard is not executed,
        // since we may make some holes during the process.
        </span><span class="kw">unsafe </span>{ <span class="self">self</span>.set_len(<span class="number">0</span>) };

        <span class="comment">// Vec: [Kept, Kept, Hole, Hole, Hole, Hole, Unchecked, Unchecked]
        //      |&lt;-              processed len   -&gt;| ^- next to check
        //                  |&lt;-  deleted cnt     -&gt;|
        //      |&lt;-              original_len                          -&gt;|
        // Kept: Elements which predicate returns true on.
        // Hole: Moved or dropped element slot.
        // Unchecked: Unchecked valid elements.
        //
        // This drop guard will be invoked when predicate or `drop` of element panicked.
        // It shifts unchecked elements to cover holes and `set_len` to the correct length.
        // In cases when predicate and `drop` never panick, it will be optimized out.
        </span><span class="kw">struct </span>BackshiftOnDrop&lt;<span class="lifetime">'a</span>, T, <span class="kw">const </span>N: usize&gt; {
            v: <span class="kw-2">&amp;</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Vec&lt;T, N&gt;,
            processed_len: usize,
            deleted_cnt: usize,
            original_len: usize,
        }

        <span class="kw">impl</span>&lt;T, <span class="kw">const </span>N: usize&gt; Drop <span class="kw">for </span>BackshiftOnDrop&lt;<span class="lifetime">'_</span>, T, N&gt; {
            <span class="kw">fn </span>drop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
                <span class="kw">if </span><span class="self">self</span>.deleted_cnt &gt; <span class="number">0 </span>{
                    <span class="comment">// SAFETY: Trailing unchecked items must be valid since we never touch them.
                    </span><span class="kw">unsafe </span>{
                        ptr::copy(
                            <span class="self">self</span>.v.as_ptr().add(<span class="self">self</span>.processed_len),
                            <span class="self">self</span>.v
                                .as_mut_ptr()
                                .add(<span class="self">self</span>.processed_len - <span class="self">self</span>.deleted_cnt),
                            <span class="self">self</span>.original_len - <span class="self">self</span>.processed_len,
                        );
                    }
                }
                <span class="comment">// SAFETY: After filling holes, all items are in contiguous memory.
                </span><span class="kw">unsafe </span>{
                    <span class="self">self</span>.v.set_len(<span class="self">self</span>.original_len - <span class="self">self</span>.deleted_cnt);
                }
            }
        }

        <span class="kw">let </span><span class="kw-2">mut </span>g = BackshiftOnDrop {
            v: <span class="self">self</span>,
            processed_len: <span class="number">0</span>,
            deleted_cnt: <span class="number">0</span>,
            original_len,
        };

        <span class="kw">fn </span>process_loop&lt;F, T, <span class="kw">const </span>N: usize, <span class="kw">const </span>DELETED: bool&gt;(
            original_len: usize,
            f: <span class="kw-2">&amp;mut </span>F,
            g: <span class="kw-2">&amp;mut </span>BackshiftOnDrop&lt;<span class="lifetime">'_</span>, T, N&gt;,
        ) <span class="kw">where
            </span>F: FnMut(<span class="kw-2">&amp;mut </span>T) -&gt; bool,
        {
            <span class="kw">while </span>g.processed_len != original_len {
                <span class="kw">let </span>p = g.v.as_mut_ptr();
                <span class="comment">// SAFETY: Unchecked element must be valid.
                </span><span class="kw">let </span>cur = <span class="kw">unsafe </span>{ <span class="kw-2">&amp;mut *</span>p.add(g.processed_len) };
                <span class="kw">if </span>!f(cur) {
                    <span class="comment">// Advance early to avoid double drop if `drop_in_place` panicked.
                    </span>g.processed_len += <span class="number">1</span>;
                    g.deleted_cnt += <span class="number">1</span>;
                    <span class="comment">// SAFETY: We never touch this element again after dropped.
                    </span><span class="kw">unsafe </span>{ ptr::drop_in_place(cur) };
                    <span class="comment">// We already advanced the counter.
                    </span><span class="kw">if </span>DELETED {
                        <span class="kw">continue</span>;
                    } <span class="kw">else </span>{
                        <span class="kw">break</span>;
                    }
                }
                <span class="kw">if </span>DELETED {
                    <span class="comment">// SAFETY: `deleted_cnt` &gt; 0, so the hole slot must not overlap with current element.
                    // We use copy for move, and never touch this element again.
                    </span><span class="kw">unsafe </span>{
                        <span class="kw">let </span>hole_slot = p.add(g.processed_len - g.deleted_cnt);
                        ptr::copy_nonoverlapping(cur, hole_slot, <span class="number">1</span>);
                    }
                }
                g.processed_len += <span class="number">1</span>;
            }
        }

        <span class="comment">// Stage 1: Nothing was deleted.
        </span>process_loop::&lt;F, T, N, <span class="bool-val">false</span>&gt;(original_len, <span class="kw-2">&amp;mut </span>f, <span class="kw-2">&amp;mut </span>g);

        <span class="comment">// Stage 2: Some elements were deleted.
        </span>process_loop::&lt;F, T, N, <span class="bool-val">true</span>&gt;(original_len, <span class="kw-2">&amp;mut </span>f, <span class="kw-2">&amp;mut </span>g);

        <span class="comment">// All item are processed. This can be optimized to `set_len` by LLVM.
        </span>drop(g);
    }
}

<span class="comment">// Trait implementations

</span><span class="kw">impl</span>&lt;T, <span class="kw">const </span>N: usize&gt; Default <span class="kw">for </span>Vec&lt;T, N&gt; {
    <span class="kw">fn </span>default() -&gt; <span class="self">Self </span>{
        <span class="self">Self</span>::new()
    }
}

<span class="kw">impl</span>&lt;T, <span class="kw">const </span>N: usize&gt; fmt::Debug <span class="kw">for </span>Vec&lt;T, N&gt;
<span class="kw">where
    </span>T: fmt::Debug,
{
    <span class="kw">fn </span>fmt(<span class="kw-2">&amp;</span><span class="self">self</span>, f: <span class="kw-2">&amp;mut </span>fmt::Formatter&lt;<span class="lifetime">'_</span>&gt;) -&gt; fmt::Result {
        &lt;[T] <span class="kw">as </span>fmt::Debug&gt;::fmt(<span class="self">self</span>, f)
    }
}

<span class="kw">impl</span>&lt;<span class="kw">const </span>N: usize&gt; fmt::Write <span class="kw">for </span>Vec&lt;u8, N&gt; {
    <span class="kw">fn </span>write_str(<span class="kw-2">&amp;mut </span><span class="self">self</span>, s: <span class="kw-2">&amp;</span>str) -&gt; fmt::Result {
        <span class="kw">match </span><span class="self">self</span>.extend_from_slice(s.as_bytes()) {
            <span class="prelude-val">Ok</span>(()) =&gt; <span class="prelude-val">Ok</span>(()),
            <span class="prelude-val">Err</span>(<span class="kw">_</span>) =&gt; <span class="prelude-val">Err</span>(fmt::Error),
        }
    }
}

<span class="kw">impl</span>&lt;T, <span class="kw">const </span>N: usize&gt; Drop <span class="kw">for </span>Vec&lt;T, N&gt; {
    <span class="kw">fn </span>drop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
        <span class="comment">// We drop each element used in the vector by turning into a &amp;mut[T]
        </span><span class="kw">unsafe </span>{
            ptr::drop_in_place(<span class="self">self</span>.as_mut_slice());
        }
    }
}

<span class="kw">impl</span>&lt;<span class="lifetime">'a</span>, T: Clone, <span class="kw">const </span>N: usize&gt; TryFrom&lt;<span class="kw-2">&amp;</span><span class="lifetime">'a </span>[T]&gt; <span class="kw">for </span>Vec&lt;T, N&gt; {
    <span class="kw">type </span>Error = ();

    <span class="kw">fn </span>try_from(slice: <span class="kw-2">&amp;</span><span class="lifetime">'a </span>[T]) -&gt; <span class="prelude-ty">Result</span>&lt;<span class="self">Self</span>, <span class="self">Self</span>::Error&gt; {
        Vec::from_slice(slice)
    }
}

<span class="kw">impl</span>&lt;T, <span class="kw">const </span>N: usize&gt; Extend&lt;T&gt; <span class="kw">for </span>Vec&lt;T, N&gt; {
    <span class="kw">fn </span>extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, iter: I)
    <span class="kw">where
        </span>I: IntoIterator&lt;Item = T&gt;,
    {
        <span class="self">self</span>.extend(iter)
    }
}

<span class="kw">impl</span>&lt;<span class="lifetime">'a</span>, T, <span class="kw">const </span>N: usize&gt; Extend&lt;<span class="kw-2">&amp;</span><span class="lifetime">'a </span>T&gt; <span class="kw">for </span>Vec&lt;T, N&gt;
<span class="kw">where
    </span>T: <span class="lifetime">'a </span>+ Copy,
{
    <span class="kw">fn </span>extend&lt;I&gt;(<span class="kw-2">&amp;mut </span><span class="self">self</span>, iter: I)
    <span class="kw">where
        </span>I: IntoIterator&lt;Item = <span class="kw-2">&amp;</span><span class="lifetime">'a </span>T&gt;,
    {
        <span class="self">self</span>.extend(iter.into_iter().cloned())
    }
}

<span class="kw">impl</span>&lt;T, <span class="kw">const </span>N: usize&gt; hash::Hash <span class="kw">for </span>Vec&lt;T, N&gt;
<span class="kw">where
    </span>T: core::hash::Hash,
{
    <span class="kw">fn </span>hash&lt;H: hash::Hasher&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, state: <span class="kw-2">&amp;mut </span>H) {
        &lt;[T] <span class="kw">as </span>hash::Hash&gt;::hash(<span class="self">self</span>, state)
    }
}

<span class="kw">impl</span>&lt;T, <span class="kw">const </span>N: usize&gt; hash32::Hash <span class="kw">for </span>Vec&lt;T, N&gt;
<span class="kw">where
    </span>T: hash32::Hash,
{
    <span class="kw">fn </span>hash&lt;H: hash32::Hasher&gt;(<span class="kw-2">&amp;</span><span class="self">self</span>, state: <span class="kw-2">&amp;mut </span>H) {
        &lt;[T] <span class="kw">as </span>hash32::Hash&gt;::hash(<span class="self">self</span>, state)
    }
}

<span class="kw">impl</span>&lt;<span class="lifetime">'a</span>, T, <span class="kw">const </span>N: usize&gt; IntoIterator <span class="kw">for </span><span class="kw-2">&amp;</span><span class="lifetime">'a </span>Vec&lt;T, N&gt; {
    <span class="kw">type </span>Item = <span class="kw-2">&amp;</span><span class="lifetime">'a </span>T;
    <span class="kw">type </span>IntoIter = slice::Iter&lt;<span class="lifetime">'a</span>, T&gt;;

    <span class="kw">fn </span>into_iter(<span class="self">self</span>) -&gt; <span class="self">Self</span>::IntoIter {
        <span class="self">self</span>.iter()
    }
}

<span class="kw">impl</span>&lt;<span class="lifetime">'a</span>, T, <span class="kw">const </span>N: usize&gt; IntoIterator <span class="kw">for </span><span class="kw-2">&amp;</span><span class="lifetime">'a </span><span class="kw-2">mut </span>Vec&lt;T, N&gt; {
    <span class="kw">type </span>Item = <span class="kw-2">&amp;</span><span class="lifetime">'a </span><span class="kw-2">mut </span>T;
    <span class="kw">type </span>IntoIter = slice::IterMut&lt;<span class="lifetime">'a</span>, T&gt;;

    <span class="kw">fn </span>into_iter(<span class="self">self</span>) -&gt; <span class="self">Self</span>::IntoIter {
        <span class="self">self</span>.iter_mut()
    }
}

<span class="kw">impl</span>&lt;T, <span class="kw">const </span>N: usize&gt; FromIterator&lt;T&gt; <span class="kw">for </span>Vec&lt;T, N&gt; {
    <span class="kw">fn </span>from_iter&lt;I&gt;(iter: I) -&gt; <span class="self">Self
    </span><span class="kw">where
        </span>I: IntoIterator&lt;Item = T&gt;,
    {
        <span class="kw">let </span><span class="kw-2">mut </span>vec = Vec::new();
        <span class="kw">for </span>i <span class="kw">in </span>iter {
            vec.push(i).ok().expect(<span class="string">"Vec::from_iter overflow"</span>);
        }
        vec
    }
}

<span class="doccomment">/// An iterator that moves out of an [`Vec`][`Vec`].
///
/// This struct is created by calling the `into_iter` method on [`Vec`][`Vec`].
///
/// [`Vec`]: (https://doc.rust-lang.org/std/vec/struct.Vec.html)
///
</span><span class="kw">pub struct </span>IntoIter&lt;T, <span class="kw">const </span>N: usize&gt; {
    vec: Vec&lt;T, N&gt;,
    next: usize,
}

<span class="kw">impl</span>&lt;T, <span class="kw">const </span>N: usize&gt; Iterator <span class="kw">for </span>IntoIter&lt;T, N&gt; {
    <span class="kw">type </span>Item = T;
    <span class="kw">fn </span>next(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="prelude-ty">Option</span>&lt;<span class="self">Self</span>::Item&gt; {
        <span class="kw">if </span><span class="self">self</span>.next &lt; <span class="self">self</span>.vec.len() {
            <span class="kw">let </span>item = <span class="kw">unsafe </span>{
                (<span class="self">self</span>.vec.buffer.get_unchecked_mut(<span class="self">self</span>.next).as_ptr() <span class="kw">as </span><span class="kw-2">*const </span>T).read()
            };
            <span class="self">self</span>.next += <span class="number">1</span>;
            <span class="prelude-val">Some</span>(item)
        } <span class="kw">else </span>{
            <span class="prelude-val">None
        </span>}
    }
}

<span class="kw">impl</span>&lt;T, <span class="kw">const </span>N: usize&gt; Clone <span class="kw">for </span>IntoIter&lt;T, N&gt;
<span class="kw">where
    </span>T: Clone,
{
    <span class="kw">fn </span>clone(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self </span>{
        <span class="kw">let </span><span class="kw-2">mut </span>vec = Vec::new();

        <span class="kw">if </span><span class="self">self</span>.next &lt; <span class="self">self</span>.vec.len() {
            <span class="kw">let </span>s = <span class="kw">unsafe </span>{
                slice::from_raw_parts(
                    (<span class="self">self</span>.vec.buffer.as_ptr() <span class="kw">as </span><span class="kw-2">*const </span>T).add(<span class="self">self</span>.next),
                    <span class="self">self</span>.vec.len() - <span class="self">self</span>.next,
                )
            };
            vec.extend_from_slice(s).ok();
        }

        <span class="self">Self </span>{ vec, next: <span class="number">0 </span>}
    }
}

<span class="kw">impl</span>&lt;T, <span class="kw">const </span>N: usize&gt; Drop <span class="kw">for </span>IntoIter&lt;T, N&gt; {
    <span class="kw">fn </span>drop(<span class="kw-2">&amp;mut </span><span class="self">self</span>) {
        <span class="kw">unsafe </span>{
            <span class="comment">// Drop all the elements that have not been moved out of vec
            </span>ptr::drop_in_place(<span class="kw-2">&amp;mut </span><span class="self">self</span>.vec.as_mut_slice()[<span class="self">self</span>.next..]);
            <span class="comment">// Prevent dropping of other elements
            </span><span class="self">self</span>.vec.len = <span class="number">0</span>;
        }
    }
}

<span class="kw">impl</span>&lt;T, <span class="kw">const </span>N: usize&gt; IntoIterator <span class="kw">for </span>Vec&lt;T, N&gt; {
    <span class="kw">type </span>Item = T;
    <span class="kw">type </span>IntoIter = IntoIter&lt;T, N&gt;;

    <span class="kw">fn </span>into_iter(<span class="self">self</span>) -&gt; <span class="self">Self</span>::IntoIter {
        IntoIter { vec: <span class="self">self</span>, next: <span class="number">0 </span>}
    }
}

<span class="kw">impl</span>&lt;A, B, <span class="kw">const </span>N1: usize, <span class="kw">const </span>N2: usize&gt; PartialEq&lt;Vec&lt;B, N2&gt;&gt; <span class="kw">for </span>Vec&lt;A, N1&gt;
<span class="kw">where
    </span>A: PartialEq&lt;B&gt;,
{
    <span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Vec&lt;B, N2&gt;) -&gt; bool {
        &lt;[A]&gt;::eq(<span class="self">self</span>, <span class="kw-2">&amp;**</span>other)
    }
}

<span class="comment">// Vec&lt;A, N&gt; == [B]
</span><span class="kw">impl</span>&lt;A, B, <span class="kw">const </span>N: usize&gt; PartialEq&lt;[B]&gt; <span class="kw">for </span>Vec&lt;A, N&gt;
<span class="kw">where
    </span>A: PartialEq&lt;B&gt;,
{
    <span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>[B]) -&gt; bool {
        &lt;[A]&gt;::eq(<span class="self">self</span>, <span class="kw-2">&amp;</span>other[..])
    }
}

<span class="comment">// [B] == Vec&lt;A, N&gt;
</span><span class="kw">impl</span>&lt;A, B, <span class="kw">const </span>N: usize&gt; PartialEq&lt;Vec&lt;A, N&gt;&gt; <span class="kw">for </span>[B]
<span class="kw">where
    </span>A: PartialEq&lt;B&gt;,
{
    <span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Vec&lt;A, N&gt;) -&gt; bool {
        &lt;[A]&gt;::eq(other, <span class="kw-2">&amp;</span><span class="self">self</span>[..])
    }
}

<span class="comment">// Vec&lt;A, N&gt; == &amp;[B]
</span><span class="kw">impl</span>&lt;A, B, <span class="kw">const </span>N: usize&gt; PartialEq&lt;<span class="kw-2">&amp;</span>[B]&gt; <span class="kw">for </span>Vec&lt;A, N&gt;
<span class="kw">where
    </span>A: PartialEq&lt;B&gt;,
{
    <span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: &amp;&amp;[B]) -&gt; bool {
        &lt;[A]&gt;::eq(<span class="self">self</span>, <span class="kw-2">&amp;</span>other[..])
    }
}

<span class="comment">// &amp;[B] == Vec&lt;A, N&gt;
</span><span class="kw">impl</span>&lt;A, B, <span class="kw">const </span>N: usize&gt; PartialEq&lt;Vec&lt;A, N&gt;&gt; <span class="kw">for </span><span class="kw-2">&amp;</span>[B]
<span class="kw">where
    </span>A: PartialEq&lt;B&gt;,
{
    <span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Vec&lt;A, N&gt;) -&gt; bool {
        &lt;[A]&gt;::eq(other, <span class="kw-2">&amp;</span><span class="self">self</span>[..])
    }
}

<span class="comment">// Vec&lt;A, N&gt; == &amp;mut [B]
</span><span class="kw">impl</span>&lt;A, B, <span class="kw">const </span>N: usize&gt; PartialEq&lt;<span class="kw-2">&amp;mut </span>[B]&gt; <span class="kw">for </span>Vec&lt;A, N&gt;
<span class="kw">where
    </span>A: PartialEq&lt;B&gt;,
{
    <span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: &amp;&amp;<span class="kw-2">mut </span>[B]) -&gt; bool {
        &lt;[A]&gt;::eq(<span class="self">self</span>, <span class="kw-2">&amp;</span>other[..])
    }
}

<span class="comment">// &amp;mut [B] == Vec&lt;A, N&gt;
</span><span class="kw">impl</span>&lt;A, B, <span class="kw">const </span>N: usize&gt; PartialEq&lt;Vec&lt;A, N&gt;&gt; <span class="kw">for </span><span class="kw-2">&amp;mut </span>[B]
<span class="kw">where
    </span>A: PartialEq&lt;B&gt;,
{
    <span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Vec&lt;A, N&gt;) -&gt; bool {
        &lt;[A]&gt;::eq(other, <span class="kw-2">&amp;</span><span class="self">self</span>[..])
    }
}

<span class="comment">// Vec&lt;A, N&gt; == [B; M]
// Equality does not require equal capacity
</span><span class="kw">impl</span>&lt;A, B, <span class="kw">const </span>N: usize, <span class="kw">const </span>M: usize&gt; PartialEq&lt;[B; M]&gt; <span class="kw">for </span>Vec&lt;A, N&gt;
<span class="kw">where
    </span>A: PartialEq&lt;B&gt;,
{
    <span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>[B; M]) -&gt; bool {
        &lt;[A]&gt;::eq(<span class="self">self</span>, <span class="kw-2">&amp;</span>other[..])
    }
}

<span class="comment">// [B; M] == Vec&lt;A, N&gt;
// Equality does not require equal capacity
</span><span class="kw">impl</span>&lt;A, B, <span class="kw">const </span>N: usize, <span class="kw">const </span>M: usize&gt; PartialEq&lt;Vec&lt;A, N&gt;&gt; <span class="kw">for </span>[B; M]
<span class="kw">where
    </span>A: PartialEq&lt;B&gt;,
{
    <span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Vec&lt;A, N&gt;) -&gt; bool {
        &lt;[A]&gt;::eq(other, <span class="kw-2">&amp;</span><span class="self">self</span>[..])
    }
}

<span class="comment">// Vec&lt;A, N&gt; == &amp;[B; M]
// Equality does not require equal capacity
</span><span class="kw">impl</span>&lt;A, B, <span class="kw">const </span>N: usize, <span class="kw">const </span>M: usize&gt; PartialEq&lt;<span class="kw-2">&amp;</span>[B; M]&gt; <span class="kw">for </span>Vec&lt;A, N&gt;
<span class="kw">where
    </span>A: PartialEq&lt;B&gt;,
{
    <span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: &amp;&amp;[B; M]) -&gt; bool {
        &lt;[A]&gt;::eq(<span class="self">self</span>, <span class="kw-2">&amp;</span>other[..])
    }
}

<span class="comment">// &amp;[B; M] == Vec&lt;A, N&gt;
// Equality does not require equal capacity
</span><span class="kw">impl</span>&lt;A, B, <span class="kw">const </span>N: usize, <span class="kw">const </span>M: usize&gt; PartialEq&lt;Vec&lt;A, N&gt;&gt; <span class="kw">for </span><span class="kw-2">&amp;</span>[B; M]
<span class="kw">where
    </span>A: PartialEq&lt;B&gt;,
{
    <span class="kw">fn </span>eq(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Vec&lt;A, N&gt;) -&gt; bool {
        &lt;[A]&gt;::eq(other, <span class="kw-2">&amp;</span><span class="self">self</span>[..])
    }
}

<span class="comment">// Implements Eq if underlying data is Eq
</span><span class="kw">impl</span>&lt;T, <span class="kw">const </span>N: usize&gt; Eq <span class="kw">for </span>Vec&lt;T, N&gt; <span class="kw">where </span>T: Eq {}

<span class="kw">impl</span>&lt;T, <span class="kw">const </span>N1: usize, <span class="kw">const </span>N2: usize&gt; PartialOrd&lt;Vec&lt;T, N2&gt;&gt; <span class="kw">for </span>Vec&lt;T, N1&gt;
<span class="kw">where
    </span>T: PartialOrd,
{
    <span class="kw">fn </span>partial_cmp(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span>Vec&lt;T, N2&gt;) -&gt; <span class="prelude-ty">Option</span>&lt;Ordering&gt; {
        PartialOrd::partial_cmp(<span class="kw-2">&amp;**</span><span class="self">self</span>, <span class="kw-2">&amp;**</span>other)
    }
}

<span class="kw">impl</span>&lt;T, <span class="kw">const </span>N: usize&gt; Ord <span class="kw">for </span>Vec&lt;T, N&gt;
<span class="kw">where
    </span>T: Ord,
{
    <span class="attr">#[inline]
    </span><span class="kw">fn </span>cmp(<span class="kw-2">&amp;</span><span class="self">self</span>, other: <span class="kw-2">&amp;</span><span class="self">Self</span>) -&gt; Ordering {
        Ord::cmp(<span class="kw-2">&amp;**</span><span class="self">self</span>, <span class="kw-2">&amp;**</span>other)
    }
}

<span class="kw">impl</span>&lt;T, <span class="kw">const </span>N: usize&gt; ops::Deref <span class="kw">for </span>Vec&lt;T, N&gt; {
    <span class="kw">type </span>Target = [T];

    <span class="kw">fn </span>deref(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>[T] {
        <span class="self">self</span>.as_slice()
    }
}

<span class="kw">impl</span>&lt;T, <span class="kw">const </span>N: usize&gt; ops::DerefMut <span class="kw">for </span>Vec&lt;T, N&gt; {
    <span class="kw">fn </span>deref_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>[T] {
        <span class="self">self</span>.as_mut_slice()
    }
}

<span class="kw">impl</span>&lt;T, <span class="kw">const </span>N: usize&gt; AsRef&lt;Vec&lt;T, N&gt;&gt; <span class="kw">for </span>Vec&lt;T, N&gt; {
    <span class="attr">#[inline]
    </span><span class="kw">fn </span>as_ref(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span><span class="self">Self </span>{
        <span class="self">self
    </span>}
}

<span class="kw">impl</span>&lt;T, <span class="kw">const </span>N: usize&gt; AsMut&lt;Vec&lt;T, N&gt;&gt; <span class="kw">for </span>Vec&lt;T, N&gt; {
    <span class="attr">#[inline]
    </span><span class="kw">fn </span>as_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span><span class="self">Self </span>{
        <span class="self">self
    </span>}
}

<span class="kw">impl</span>&lt;T, <span class="kw">const </span>N: usize&gt; AsRef&lt;[T]&gt; <span class="kw">for </span>Vec&lt;T, N&gt; {
    <span class="attr">#[inline]
    </span><span class="kw">fn </span>as_ref(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;</span>[T] {
        <span class="self">self
    </span>}
}

<span class="kw">impl</span>&lt;T, <span class="kw">const </span>N: usize&gt; AsMut&lt;[T]&gt; <span class="kw">for </span>Vec&lt;T, N&gt; {
    <span class="attr">#[inline]
    </span><span class="kw">fn </span>as_mut(<span class="kw-2">&amp;mut </span><span class="self">self</span>) -&gt; <span class="kw-2">&amp;mut </span>[T] {
        <span class="self">self
    </span>}
}

<span class="kw">impl</span>&lt;T, <span class="kw">const </span>N: usize&gt; Clone <span class="kw">for </span>Vec&lt;T, N&gt;
<span class="kw">where
    </span>T: Clone,
{
    <span class="kw">fn </span>clone(<span class="kw-2">&amp;</span><span class="self">self</span>) -&gt; <span class="self">Self </span>{
        <span class="self">self</span>.clone()
    }
}

<span class="attr">#[cfg(test)]
</span><span class="kw">mod </span>tests {
    <span class="kw">use </span><span class="kw">crate</span>::Vec;
    <span class="kw">use </span>core::fmt::Write;

    <span class="attr">#[test]
    </span><span class="kw">fn </span>static_new() {
        <span class="kw">static </span><span class="kw-2">mut </span>_V: Vec&lt;i32, <span class="number">4</span>&gt; = Vec::new();
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>stack_new() {
        <span class="kw">let </span><span class="kw-2">mut </span>_v: Vec&lt;i32, <span class="number">4</span>&gt; = Vec::new();
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>is_full_empty() {
        <span class="kw">let </span><span class="kw-2">mut </span>v: Vec&lt;i32, <span class="number">4</span>&gt; = Vec::new();

        <span class="macro">assert!</span>(v.is_empty());
        <span class="macro">assert!</span>(!v.is_full());

        v.push(<span class="number">1</span>).unwrap();
        <span class="macro">assert!</span>(!v.is_empty());
        <span class="macro">assert!</span>(!v.is_full());

        v.push(<span class="number">1</span>).unwrap();
        <span class="macro">assert!</span>(!v.is_empty());
        <span class="macro">assert!</span>(!v.is_full());

        v.push(<span class="number">1</span>).unwrap();
        <span class="macro">assert!</span>(!v.is_empty());
        <span class="macro">assert!</span>(!v.is_full());

        v.push(<span class="number">1</span>).unwrap();
        <span class="macro">assert!</span>(!v.is_empty());
        <span class="macro">assert!</span>(v.is_full());
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>drop() {
        <span class="macro">droppable!</span>();

        {
            <span class="kw">let </span><span class="kw-2">mut </span>v: Vec&lt;Droppable, <span class="number">2</span>&gt; = Vec::new();
            v.push(Droppable::new()).ok().unwrap();
            v.push(Droppable::new()).ok().unwrap();
            v.pop().unwrap();
        }

        <span class="macro">assert_eq!</span>(Droppable::count(), <span class="number">0</span>);

        {
            <span class="kw">let </span><span class="kw-2">mut </span>v: Vec&lt;Droppable, <span class="number">2</span>&gt; = Vec::new();
            v.push(Droppable::new()).ok().unwrap();
            v.push(Droppable::new()).ok().unwrap();
        }

        <span class="macro">assert_eq!</span>(Droppable::count(), <span class="number">0</span>);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>eq() {
        <span class="kw">let </span><span class="kw-2">mut </span>xs: Vec&lt;i32, <span class="number">4</span>&gt; = Vec::new();
        <span class="kw">let </span><span class="kw-2">mut </span>ys: Vec&lt;i32, <span class="number">8</span>&gt; = Vec::new();

        <span class="macro">assert_eq!</span>(xs, ys);

        xs.push(<span class="number">1</span>).unwrap();
        ys.push(<span class="number">1</span>).unwrap();

        <span class="macro">assert_eq!</span>(xs, ys);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>cmp() {
        <span class="kw">let </span><span class="kw-2">mut </span>xs: Vec&lt;i32, <span class="number">4</span>&gt; = Vec::new();
        <span class="kw">let </span><span class="kw-2">mut </span>ys: Vec&lt;i32, <span class="number">4</span>&gt; = Vec::new();

        <span class="macro">assert_eq!</span>(xs, ys);

        xs.push(<span class="number">1</span>).unwrap();
        ys.push(<span class="number">2</span>).unwrap();

        <span class="macro">assert!</span>(xs &lt; ys);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>cmp_heterogenous_size() {
        <span class="kw">let </span><span class="kw-2">mut </span>xs: Vec&lt;i32, <span class="number">4</span>&gt; = Vec::new();
        <span class="kw">let </span><span class="kw-2">mut </span>ys: Vec&lt;i32, <span class="number">8</span>&gt; = Vec::new();

        <span class="macro">assert_eq!</span>(xs, ys);

        xs.push(<span class="number">1</span>).unwrap();
        ys.push(<span class="number">2</span>).unwrap();

        <span class="macro">assert!</span>(xs &lt; ys);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>cmp_with_arrays_and_slices() {
        <span class="kw">let </span><span class="kw-2">mut </span>xs: Vec&lt;i32, <span class="number">12</span>&gt; = Vec::new();
        xs.push(<span class="number">1</span>).unwrap();

        <span class="kw">let </span>array = [<span class="number">1</span>];

        <span class="macro">assert_eq!</span>(xs, array);
        <span class="macro">assert_eq!</span>(array, xs);

        <span class="macro">assert_eq!</span>(xs, array.as_slice());
        <span class="macro">assert_eq!</span>(array.as_slice(), xs);

        <span class="macro">assert_eq!</span>(xs, <span class="kw-2">&amp;</span>array);
        <span class="macro">assert_eq!</span>(<span class="kw-2">&amp;</span>array, xs);

        <span class="kw">let </span>longer_array = [<span class="number">1</span>; <span class="number">20</span>];

        <span class="macro">assert_ne!</span>(xs, longer_array);
        <span class="macro">assert_ne!</span>(longer_array, xs);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>full() {
        <span class="kw">let </span><span class="kw-2">mut </span>v: Vec&lt;i32, <span class="number">4</span>&gt; = Vec::new();

        v.push(<span class="number">0</span>).unwrap();
        v.push(<span class="number">1</span>).unwrap();
        v.push(<span class="number">2</span>).unwrap();
        v.push(<span class="number">3</span>).unwrap();

        <span class="macro">assert!</span>(v.push(<span class="number">4</span>).is_err());
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>iter() {
        <span class="kw">let </span><span class="kw-2">mut </span>v: Vec&lt;i32, <span class="number">4</span>&gt; = Vec::new();

        v.push(<span class="number">0</span>).unwrap();
        v.push(<span class="number">1</span>).unwrap();
        v.push(<span class="number">2</span>).unwrap();
        v.push(<span class="number">3</span>).unwrap();

        <span class="kw">let </span><span class="kw-2">mut </span>items = v.iter();

        <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="number">0</span>));
        <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="number">1</span>));
        <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="number">2</span>));
        <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;</span><span class="number">3</span>));
        <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">None</span>);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>iter_mut() {
        <span class="kw">let </span><span class="kw-2">mut </span>v: Vec&lt;i32, <span class="number">4</span>&gt; = Vec::new();

        v.push(<span class="number">0</span>).unwrap();
        v.push(<span class="number">1</span>).unwrap();
        v.push(<span class="number">2</span>).unwrap();
        v.push(<span class="number">3</span>).unwrap();

        <span class="kw">let </span><span class="kw-2">mut </span>items = v.iter_mut();

        <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;mut </span><span class="number">0</span>));
        <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;mut </span><span class="number">1</span>));
        <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;mut </span><span class="number">2</span>));
        <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">Some</span>(<span class="kw-2">&amp;mut </span><span class="number">3</span>));
        <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">None</span>);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>collect_from_iter() {
        <span class="kw">let </span>slice = <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
        <span class="kw">let </span>vec: Vec&lt;i32, <span class="number">4</span>&gt; = slice.iter().cloned().collect();
        <span class="macro">assert_eq!</span>(<span class="kw-2">&amp;</span>vec, slice);
    }

    <span class="attr">#[test]
    #[should_panic]
    </span><span class="kw">fn </span>collect_from_iter_overfull() {
        <span class="kw">let </span>slice = <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>];
        <span class="kw">let </span>_vec = slice.iter().cloned().collect::&lt;Vec&lt;<span class="kw">_</span>, <span class="number">2</span>&gt;&gt;();
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>iter_move() {
        <span class="kw">let </span><span class="kw-2">mut </span>v: Vec&lt;i32, <span class="number">4</span>&gt; = Vec::new();
        v.push(<span class="number">0</span>).unwrap();
        v.push(<span class="number">1</span>).unwrap();
        v.push(<span class="number">2</span>).unwrap();
        v.push(<span class="number">3</span>).unwrap();

        <span class="kw">let </span><span class="kw-2">mut </span>items = v.into_iter();

        <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">Some</span>(<span class="number">0</span>));
        <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">Some</span>(<span class="number">1</span>));
        <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">Some</span>(<span class="number">2</span>));
        <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">Some</span>(<span class="number">3</span>));
        <span class="macro">assert_eq!</span>(items.next(), <span class="prelude-val">None</span>);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>iter_move_drop() {
        <span class="macro">droppable!</span>();

        {
            <span class="kw">let </span><span class="kw-2">mut </span>vec: Vec&lt;Droppable, <span class="number">2</span>&gt; = Vec::new();
            vec.push(Droppable::new()).ok().unwrap();
            vec.push(Droppable::new()).ok().unwrap();
            <span class="kw">let </span><span class="kw-2">mut </span>items = vec.into_iter();
            <span class="comment">// Move all
            </span><span class="kw">let _ </span>= items.next();
            <span class="kw">let _ </span>= items.next();
        }

        <span class="macro">assert_eq!</span>(Droppable::count(), <span class="number">0</span>);

        {
            <span class="kw">let </span><span class="kw-2">mut </span>vec: Vec&lt;Droppable, <span class="number">2</span>&gt; = Vec::new();
            vec.push(Droppable::new()).ok().unwrap();
            vec.push(Droppable::new()).ok().unwrap();
            <span class="kw">let </span>_items = vec.into_iter();
            <span class="comment">// Move none
        </span>}

        <span class="macro">assert_eq!</span>(Droppable::count(), <span class="number">0</span>);

        {
            <span class="kw">let </span><span class="kw-2">mut </span>vec: Vec&lt;Droppable, <span class="number">2</span>&gt; = Vec::new();
            vec.push(Droppable::new()).ok().unwrap();
            vec.push(Droppable::new()).ok().unwrap();
            <span class="kw">let </span><span class="kw-2">mut </span>items = vec.into_iter();
            <span class="kw">let _ </span>= items.next(); <span class="comment">// Move partly
        </span>}

        <span class="macro">assert_eq!</span>(Droppable::count(), <span class="number">0</span>);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>push_and_pop() {
        <span class="kw">let </span><span class="kw-2">mut </span>v: Vec&lt;i32, <span class="number">4</span>&gt; = Vec::new();
        <span class="macro">assert_eq!</span>(v.len(), <span class="number">0</span>);

        <span class="macro">assert_eq!</span>(v.pop(), <span class="prelude-val">None</span>);
        <span class="macro">assert_eq!</span>(v.len(), <span class="number">0</span>);

        v.push(<span class="number">0</span>).unwrap();
        <span class="macro">assert_eq!</span>(v.len(), <span class="number">1</span>);

        <span class="macro">assert_eq!</span>(v.pop(), <span class="prelude-val">Some</span>(<span class="number">0</span>));
        <span class="macro">assert_eq!</span>(v.len(), <span class="number">0</span>);

        <span class="macro">assert_eq!</span>(v.pop(), <span class="prelude-val">None</span>);
        <span class="macro">assert_eq!</span>(v.len(), <span class="number">0</span>);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>resize_size_limit() {
        <span class="kw">let </span><span class="kw-2">mut </span>v: Vec&lt;u8, <span class="number">4</span>&gt; = Vec::new();

        v.resize(<span class="number">0</span>, <span class="number">0</span>).unwrap();
        v.resize(<span class="number">4</span>, <span class="number">0</span>).unwrap();
        v.resize(<span class="number">5</span>, <span class="number">0</span>).err().expect(<span class="string">"full"</span>);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>resize_length_cases() {
        <span class="kw">let </span><span class="kw-2">mut </span>v: Vec&lt;u8, <span class="number">4</span>&gt; = Vec::new();

        <span class="macro">assert_eq!</span>(v.len(), <span class="number">0</span>);

        <span class="comment">// Grow by 1
        </span>v.resize(<span class="number">1</span>, <span class="number">0</span>).unwrap();
        <span class="macro">assert_eq!</span>(v.len(), <span class="number">1</span>);

        <span class="comment">// Grow by 2
        </span>v.resize(<span class="number">3</span>, <span class="number">0</span>).unwrap();
        <span class="macro">assert_eq!</span>(v.len(), <span class="number">3</span>);

        <span class="comment">// Resize to current size
        </span>v.resize(<span class="number">3</span>, <span class="number">0</span>).unwrap();
        <span class="macro">assert_eq!</span>(v.len(), <span class="number">3</span>);

        <span class="comment">// Shrink by 1
        </span>v.resize(<span class="number">2</span>, <span class="number">0</span>).unwrap();
        <span class="macro">assert_eq!</span>(v.len(), <span class="number">2</span>);

        <span class="comment">// Shrink by 2
        </span>v.resize(<span class="number">0</span>, <span class="number">0</span>).unwrap();
        <span class="macro">assert_eq!</span>(v.len(), <span class="number">0</span>);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>resize_contents() {
        <span class="kw">let </span><span class="kw-2">mut </span>v: Vec&lt;u8, <span class="number">4</span>&gt; = Vec::new();

        <span class="comment">// New entries take supplied value when growing
        </span>v.resize(<span class="number">1</span>, <span class="number">17</span>).unwrap();
        <span class="macro">assert_eq!</span>(v[<span class="number">0</span>], <span class="number">17</span>);

        <span class="comment">// Old values aren't changed when growing
        </span>v.resize(<span class="number">2</span>, <span class="number">18</span>).unwrap();
        <span class="macro">assert_eq!</span>(v[<span class="number">0</span>], <span class="number">17</span>);
        <span class="macro">assert_eq!</span>(v[<span class="number">1</span>], <span class="number">18</span>);

        <span class="comment">// Old values aren't changed when length unchanged
        </span>v.resize(<span class="number">2</span>, <span class="number">0</span>).unwrap();
        <span class="macro">assert_eq!</span>(v[<span class="number">0</span>], <span class="number">17</span>);
        <span class="macro">assert_eq!</span>(v[<span class="number">1</span>], <span class="number">18</span>);

        <span class="comment">// Old values aren't changed when shrinking
        </span>v.resize(<span class="number">1</span>, <span class="number">0</span>).unwrap();
        <span class="macro">assert_eq!</span>(v[<span class="number">0</span>], <span class="number">17</span>);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>resize_default() {
        <span class="kw">let </span><span class="kw-2">mut </span>v: Vec&lt;u8, <span class="number">4</span>&gt; = Vec::new();

        <span class="comment">// resize_default is implemented using resize, so just check the
        // correct value is being written.
        </span>v.resize_default(<span class="number">1</span>).unwrap();
        <span class="macro">assert_eq!</span>(v[<span class="number">0</span>], <span class="number">0</span>);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>write() {
        <span class="kw">let </span><span class="kw-2">mut </span>v: Vec&lt;u8, <span class="number">4</span>&gt; = Vec::new();
        <span class="macro">write!</span>(v, <span class="string">"{:x}"</span>, <span class="number">1234</span>).unwrap();
        <span class="macro">assert_eq!</span>(<span class="kw-2">&amp;</span>v[..], <span class="string">b"4d2"</span>);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>extend_from_slice() {
        <span class="kw">let </span><span class="kw-2">mut </span>v: Vec&lt;u8, <span class="number">4</span>&gt; = Vec::new();
        <span class="macro">assert_eq!</span>(v.len(), <span class="number">0</span>);
        v.extend_from_slice(<span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">2</span>]).unwrap();
        <span class="macro">assert_eq!</span>(v.len(), <span class="number">2</span>);
        <span class="macro">assert_eq!</span>(v.as_slice(), <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">2</span>]);
        v.extend_from_slice(<span class="kw-2">&amp;</span>[<span class="number">3</span>]).unwrap();
        <span class="macro">assert_eq!</span>(v.len(), <span class="number">3</span>);
        <span class="macro">assert_eq!</span>(v.as_slice(), <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]);
        <span class="macro">assert!</span>(v.extend_from_slice(<span class="kw-2">&amp;</span>[<span class="number">4</span>, <span class="number">5</span>]).is_err());
        <span class="macro">assert_eq!</span>(v.len(), <span class="number">3</span>);
        <span class="macro">assert_eq!</span>(v.as_slice(), <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]);
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>from_slice() {
        <span class="comment">// Successful construction
        </span><span class="kw">let </span>v: Vec&lt;u8, <span class="number">4</span>&gt; = Vec::from_slice(<span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]).unwrap();
        <span class="macro">assert_eq!</span>(v.len(), <span class="number">3</span>);
        <span class="macro">assert_eq!</span>(v.as_slice(), <span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]);

        <span class="comment">// Slice too large
        </span><span class="macro">assert!</span>(Vec::&lt;u8, <span class="number">2</span>&gt;::from_slice(<span class="kw-2">&amp;</span>[<span class="number">1</span>, <span class="number">2</span>, <span class="number">3</span>]).is_err());
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>starts_with() {
        <span class="kw">let </span>v: Vec&lt;<span class="kw">_</span>, <span class="number">8</span>&gt; = Vec::from_slice(<span class="string">b"ab"</span>).unwrap();
        <span class="macro">assert!</span>(v.starts_with(<span class="kw-2">&amp;</span>[]));
        <span class="macro">assert!</span>(v.starts_with(<span class="string">b""</span>));
        <span class="macro">assert!</span>(v.starts_with(<span class="string">b"a"</span>));
        <span class="macro">assert!</span>(v.starts_with(<span class="string">b"ab"</span>));
        <span class="macro">assert!</span>(!v.starts_with(<span class="string">b"abc"</span>));
        <span class="macro">assert!</span>(!v.starts_with(<span class="string">b"ba"</span>));
        <span class="macro">assert!</span>(!v.starts_with(<span class="string">b"b"</span>));
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>ends_with() {
        <span class="kw">let </span>v: Vec&lt;<span class="kw">_</span>, <span class="number">8</span>&gt; = Vec::from_slice(<span class="string">b"ab"</span>).unwrap();
        <span class="macro">assert!</span>(v.ends_with(<span class="kw-2">&amp;</span>[]));
        <span class="macro">assert!</span>(v.ends_with(<span class="string">b""</span>));
        <span class="macro">assert!</span>(v.ends_with(<span class="string">b"b"</span>));
        <span class="macro">assert!</span>(v.ends_with(<span class="string">b"ab"</span>));
        <span class="macro">assert!</span>(!v.ends_with(<span class="string">b"abc"</span>));
        <span class="macro">assert!</span>(!v.ends_with(<span class="string">b"ba"</span>));
        <span class="macro">assert!</span>(!v.ends_with(<span class="string">b"a"</span>));
    }

    <span class="attr">#[test]
    </span><span class="kw">fn </span>zero_capacity() {
        <span class="kw">let </span><span class="kw-2">mut </span>v: Vec&lt;u8, <span class="number">0</span>&gt; = Vec::new();
        <span class="comment">// Validate capacity
        </span><span class="macro">assert_eq!</span>(v.capacity(), <span class="number">0</span>);

        <span class="comment">// Make sure there is no capacity
        </span><span class="macro">assert!</span>(v.push(<span class="number">1</span>).is_err());

        <span class="comment">// Validate length
        </span><span class="macro">assert_eq!</span>(v.len(), <span class="number">0</span>);

        <span class="comment">// Validate pop
        </span><span class="macro">assert_eq!</span>(v.pop(), <span class="prelude-val">None</span>);

        <span class="comment">// Validate slice
        </span><span class="macro">assert_eq!</span>(v.as_slice(), <span class="kw-2">&amp;</span>[]);

        <span class="comment">// Validate empty
        </span><span class="macro">assert!</span>(v.is_empty());

        <span class="comment">// Validate full
        </span><span class="macro">assert!</span>(v.is_full());
    }
}
</code></pre></div></section></main></body></html>