diff --git a/Cargo.toml b/Cargo.toml
index b02df9f7c8..0d762df0ae 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -13,7 +13,6 @@ license = "MIT OR Apache-2.0"
 name = "cortex-m-rtic"
 readme = "README.md"
 repository = "https://github.com/rtic-rs/cortex-m-rtic"
-
 version = "0.6.0-alpha.1"
 
 [lib]
@@ -58,7 +57,7 @@ rtic-monotonic = "0.1.0-alpha.0"
 rtic-core = "0.3.1"
 heapless = "0.6.1"
 bare-metal = "1.0.0"
-generic-array = "*"
+generic-array = "0.14"
 
 [dependencies.dwt-systick-monotonic]
 version = "0.1.0-alpha.0"
diff --git a/examples/t-schedule.rs b/examples/t-schedule.rs
index 6b6245eb50..890b3163b2 100644
--- a/examples/t-schedule.rs
+++ b/examples/t-schedule.rs
@@ -26,30 +26,93 @@ mod app {
 
         let mono = DwtSystick::new(&mut dcb, dwt, systick, 8_000_000);
 
-        let a: Result<foo::MyMono::SpawnHandle, ()> = foo::spawn_after(Seconds(1_u32));
-        if let Ok(handle) = a {
-            let _: Result<foo::MyMono::SpawnHandle, ()> = handle.reschedule_after(Seconds(1_u32));
-        }
+        // Task without message passing
 
-        let b: Result<bar::MyMono::SpawnHandle, u32> = bar::spawn_after(Seconds(2_u32), 0);
-        if let Ok(handle) = b {
-            let _: Result<u32, ()> = handle.cancel();
-        }
+        // Not default
+        let _: Result<foo::MyMono::SpawnHandle, ()> = foo::MyMono::spawn_at(MyMono::now());
+        let handle: Result<foo::MyMono::SpawnHandle, ()> = foo::MyMono::spawn_after(Seconds(1_u32));
+        let _: Result<foo::MyMono::SpawnHandle, ()> =
+            handle.unwrap().reschedule_after(Seconds(1_u32));
 
+        let handle: Result<foo::MyMono::SpawnHandle, ()> = foo::MyMono::spawn_after(Seconds(1_u32));
+        let _: Result<foo::MyMono::SpawnHandle, ()> = handle.unwrap().reschedule_at(MyMono::now());
+
+        let handle: Result<foo::MyMono::SpawnHandle, ()> = foo::MyMono::spawn_after(Seconds(1_u32));
+        let _: Result<(), ()> = handle.unwrap().cancel();
+
+        // Using default
+        let _: Result<foo::SpawnHandle, ()> = foo::spawn_at(MyMono::now());
+        let handle: Result<foo::SpawnHandle, ()> = foo::spawn_after(Seconds(1_u32));
+        let _: Result<foo::SpawnHandle, ()> = handle.unwrap().reschedule_after(Seconds(1_u32));
+
+        let handle: Result<foo::SpawnHandle, ()> = foo::spawn_after(Seconds(1_u32));
+        let _: Result<foo::SpawnHandle, ()> = handle.unwrap().reschedule_at(MyMono::now());
+
+        let handle: Result<foo::SpawnHandle, ()> = foo::spawn_after(Seconds(1_u32));
+        let _: Result<(), ()> = handle.unwrap().cancel();
+
+        // Task with single message passing
+
+        // Not default
+        let _: Result<bar::MyMono::SpawnHandle, u32> = bar::MyMono::spawn_at(MyMono::now(), 0);
+        let handle: Result<bar::MyMono::SpawnHandle, u32> =
+            bar::MyMono::spawn_after(Seconds(1_u32), 0);
+        let _: Result<bar::MyMono::SpawnHandle, ()> =
+            handle.unwrap().reschedule_after(Seconds(1_u32));
+
+        let handle: Result<bar::MyMono::SpawnHandle, u32> =
+            bar::MyMono::spawn_after(Seconds(1_u32), 0);
+        let _: Result<bar::MyMono::SpawnHandle, ()> = handle.unwrap().reschedule_at(MyMono::now());
+
+        let handle: Result<bar::MyMono::SpawnHandle, u32> =
+            bar::MyMono::spawn_after(Seconds(1_u32), 0);
+        let _: Result<u32, ()> = handle.unwrap().cancel();
+
+        // Using default
+        let _: Result<bar::SpawnHandle, u32> = bar::spawn_at(MyMono::now(), 0);
+        let handle: Result<bar::SpawnHandle, u32> = bar::spawn_after(Seconds(1_u32), 0);
+        let _: Result<bar::SpawnHandle, ()> = handle.unwrap().reschedule_after(Seconds(1_u32));
+
+        let handle: Result<bar::SpawnHandle, u32> = bar::spawn_after(Seconds(1_u32), 0);
+        let _: Result<bar::SpawnHandle, ()> = handle.unwrap().reschedule_at(MyMono::now());
+
+        let handle: Result<bar::SpawnHandle, u32> = bar::spawn_after(Seconds(1_u32), 0);
+        let _: Result<u32, ()> = handle.unwrap().cancel();
+
+        // Task with multiple message passing
+
+        // Not default
         let _: Result<baz::MyMono::SpawnHandle, (u32, u32)> =
-            baz::spawn_after(Seconds(3_u32), 0, 1);
+            baz::MyMono::spawn_at(MyMono::now(), 0, 1);
+        let handle: Result<baz::MyMono::SpawnHandle, (u32, u32)> =
+            baz::MyMono::spawn_after(Seconds(1_u32), 0, 1);
+        let _: Result<baz::MyMono::SpawnHandle, ()> =
+            handle.unwrap().reschedule_after(Seconds(1_u32));
+
+        let handle: Result<baz::MyMono::SpawnHandle, (u32, u32)> =
+            baz::MyMono::spawn_after(Seconds(1_u32), 0, 1);
+        let _: Result<baz::MyMono::SpawnHandle, ()> = handle.unwrap().reschedule_at(MyMono::now());
+
+        let handle: Result<baz::MyMono::SpawnHandle, (u32, u32)> =
+            baz::MyMono::spawn_after(Seconds(1_u32), 0, 1);
+        let _: Result<(u32, u32), ()> = handle.unwrap().cancel();
+
+        // Using default
+        let _: Result<baz::SpawnHandle, (u32, u32)> = baz::spawn_at(MyMono::now(), 0, 1);
+        let handle: Result<baz::SpawnHandle, (u32, u32)> = baz::spawn_after(Seconds(1_u32), 0, 1);
+        let _: Result<baz::SpawnHandle, ()> = handle.unwrap().reschedule_after(Seconds(1_u32));
+
+        let handle: Result<baz::SpawnHandle, (u32, u32)> = baz::spawn_after(Seconds(1_u32), 0, 1);
+        let _: Result<baz::SpawnHandle, ()> = handle.unwrap().reschedule_at(MyMono::now());
+
+        let handle: Result<baz::SpawnHandle, (u32, u32)> = baz::spawn_after(Seconds(1_u32), 0, 1);
+        let _: Result<(u32, u32), ()> = handle.unwrap().cancel();
 
         (init::LateResources {}, init::Monotonics(mono))
     }
 
     #[idle]
     fn idle(_: idle::Context) -> ! {
-        let _: Result<foo::MyMono::SpawnHandle, ()> = foo::spawn_at(MyMono::now() + Seconds(3_u32));
-        let _: Result<bar::MyMono::SpawnHandle, u32> =
-            bar::spawn_at(MyMono::now() + Seconds(4_u32), 0);
-        let _: Result<baz::MyMono::SpawnHandle, (u32, u32)> =
-            baz::spawn_at(MyMono::now() + Seconds(5_u32), 0, 1);
-
         loop {
             cortex_m::asm::nop();
         }
diff --git a/macros/src/codegen/module.rs b/macros/src/codegen/module.rs
index 5a594c66b3..e15aab1c83 100644
--- a/macros/src/codegen/module.rs
+++ b/macros/src/codegen/module.rs
@@ -319,18 +319,6 @@ pub fn codegen(
                     marker: u32,
                 }
 
-                // TODO: remove
-                impl core::fmt::Debug for SpawnHandle
-                {
-                    fn fmt(&self, f: &mut core::fmt::Formatter<'_>) -> core::fmt::Result {
-                        let handle = unsafe { &#app_path::#tq as *const _ as u32 };
-                        f.debug_struct("SpawnHandle")
-                            .field("marker", &self.marker)
-                            .field("handle", &handle)
-                            .finish()
-                    }
-                }
-
                 impl SpawnHandle {
                     pub fn cancel(self) -> Result<#ty, ()> {
                         rtic::export::interrupt::free(|_| unsafe {
diff --git a/src/lib.rs b/src/lib.rs
index a88ea81eb4..a4abc4c87b 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -32,7 +32,7 @@
 #![deny(missing_docs)]
 #![deny(rust_2018_compatibility)]
 #![deny(rust_2018_idioms)]
-// #![deny(warnings)]
+#![deny(warnings)]
 #![no_std]
 
 use cortex_m::{interrupt::InterruptNumber, peripheral::NVIC};