Since there only will be one init/idle use .first().unwrap(), matching rtic-syntax

macros/src/codegen/idle.rs

@@ -26,9 +26,8 @@ pub fn codegen(
     // call_idle
     TokenStream2,
 ) {
-    //if let Some(idle) = app.idles.get(&core) {
     if app.idles.len() > 0 {
-        let idle = &app.idles[0];
+        let idle = &app.idles.first().unwrap();
         let mut needs_lt = false;
         let mut const_app = None;
         let mut root_idle = vec![];

macros/src/codegen/init.rs

@@ -27,9 +27,8 @@ pub fn codegen(
     // call_init -- the call to the user `#[init]` if there's one
     Option<TokenStream2>,
 ) {
-    //if let Some(init) = app.inits.get(&core) {
     if app.inits.len() > 0 {
-        let init = &app.inits[0];
+        let init = &app.inits.first().unwrap();
         let mut needs_lt = false;
         let name = &init.name;
 

macros/src/codegen/module.rs

@@ -253,7 +253,7 @@ pub fn codegen(ctxt: Context, resources_tick: bool, app: &App, extra: &Extra) ->
     }
 
     if let Context::Init = ctxt {
-        let init = &app.inits[0];
+        let init = &app.inits.first().unwrap();
         if init.returns_late_resources {
             let late_resources = util::late_resources_ident(&init.name);
 

macros/src/codegen/resources_struct.rs

@@ -14,8 +14,8 @@ pub fn codegen(
     let mut lt = None;
 
     let resources = match ctxt {
-        Context::Init => &app.inits[0].args.resources,
+        Context::Init => &app.inits.first().unwrap().args.resources,
-        Context::Idle => &app.idles[0].args.resources,
+        Context::Idle => &app.idles.first().unwrap().args.resources,
         Context::HardwareTask(name) => &app.hardware_tasks[name].args.resources,
         Context::SoftwareTask(name) => &app.software_tasks[name].args.resources,
     };

macros/src/codegen/util.rs

@@ -165,8 +165,8 @@ pub fn link_section_uninit(empty_expr: bool) -> Option<TokenStream2> {
 /// Generates a pre-reexport identifier for the "locals" struct
 pub fn locals_ident(ctxt: Context, app: &App) -> Ident {
     let mut s = match ctxt {
-        Context::Init => app.inits[0].name.to_string(),
+        Context::Init => app.inits.first().unwrap().name.to_string(),
-        Context::Idle => app.idles[0].name.to_string(),
+        Context::Idle => app.idles.first().unwrap().name.to_string(),
         Context::HardwareTask(ident) | Context::SoftwareTask(ident) => ident.to_string(),
     };
 
@@ -234,8 +234,8 @@ pub fn regroup_inputs(
 /// Generates a pre-reexport identifier for the "resources" struct
 pub fn resources_ident(ctxt: Context, app: &App) -> Ident {
     let mut s = match ctxt {
-        Context::Init => app.inits[0].name.to_string(),
+        Context::Init => app.inits.first().unwrap().name.to_string(),
-        Context::Idle => app.idles[0].name.to_string(),
+        Context::Idle => app.idles.first().unwrap().name.to_string(),
         Context::HardwareTask(ident) | Context::SoftwareTask(ident) => ident.to_string(),
     };
 
@@ -266,13 +266,6 @@ pub fn schedule_t_ident() -> Ident {
     Ident::new(&format!("T"), Span::call_site())
 }
 
-/*
-/// Generates an identifier for a cross-spawn barrier
-pub fn spawn_barrier() -> Ident {
-    Ident::new(&format!("SB"), Span::call_site())
-}
-*/
-
 /// Generates an identifier for a "spawn" function
 ///
 /// The methods of the `Spawn` structs invoke these functions. As one task may be `spawn`-ed by