Fix CI.

Author: reitermarkus

cfail/ui/not-send.stderr

@@ -7,6 +7,9 @@ error[E0277]: `*const ()` cannot be sent between threads safely
    = help: within `PhantomData<*const ()>`, the trait `Send` is not implemented for `*const ()`
 note: required because it appears within the type `PhantomData<*const ()>`
   --> $RUST/core/src/marker.rs
+   |
+   | pub struct PhantomData<T: ?Sized>;
+   |            ^^^^^^^^^^^
    = note: required for `Consumer<'_, PhantomData<*const ()>, 4>` to implement `Send`
 note: required by a bound in `is_send`
   --> ui/not-send.rs:14:8
@@ -26,6 +29,9 @@ error[E0277]: `*const ()` cannot be sent between threads safely
    = help: within `PhantomData<*const ()>`, the trait `Send` is not implemented for `*const ()`
 note: required because it appears within the type `PhantomData<*const ()>`
   --> $RUST/core/src/marker.rs
+   |
+   | pub struct PhantomData<T: ?Sized>;
+   |            ^^^^^^^^^^^
    = note: required for `Producer<'_, PhantomData<*const ()>, 4>` to implement `Send`
 note: required by a bound in `is_send`
   --> ui/not-send.rs:14:8
@@ -45,12 +51,24 @@ error[E0277]: `*const ()` cannot be sent between threads safely
    = help: within `Queue<PhantomData<*const ()>, 4>`, the trait `Send` is not implemented for `*const ()`
 note: required because it appears within the type `PhantomData<*const ()>`
   --> $RUST/core/src/marker.rs
+   |
+   | pub struct PhantomData<T: ?Sized>;
+   |            ^^^^^^^^^^^
 note: required because it appears within the type `ManuallyDrop<PhantomData<*const ()>>`
   --> $RUST/core/src/mem/manually_drop.rs
+   |
+   | pub struct ManuallyDrop<T: ?Sized> {
+   |            ^^^^^^^^^^^^
 note: required because it appears within the type `MaybeUninit<PhantomData<*const ()>>`
   --> $RUST/core/src/mem/maybe_uninit.rs
+   |
+   | pub union MaybeUninit<T> {
+   |           ^^^^^^^^^^^
 note: required because it appears within the type `UnsafeCell<MaybeUninit<PhantomData<*const ()>>>`
   --> $RUST/core/src/cell.rs
+   |
+   | pub struct UnsafeCell<T: ?Sized> {
+   |            ^^^^^^^^^^
    = note: required because it appears within the type `[UnsafeCell<MaybeUninit<PhantomData<*const ()>>>; 4]`
 note: required because it appears within the type `Queue<PhantomData<*const ()>, 4>`
   --> $HEAPLESS/src/spsc.rs
@@ -75,12 +93,21 @@ error[E0277]: `*const ()` cannot be sent between threads safely
    = help: within `heapless::vec::VecInner<[MaybeUninit<PhantomData<*const ()>>; 4]>`, the trait `Send` is not implemented for `*const ()`
 note: required because it appears within the type `PhantomData<*const ()>`
   --> $RUST/core/src/marker.rs
+   |
+   | pub struct PhantomData<T: ?Sized>;
+   |            ^^^^^^^^^^^
 note: required because it appears within the type `ManuallyDrop<PhantomData<*const ()>>`
   --> $RUST/core/src/mem/manually_drop.rs
+   |
+   | pub struct ManuallyDrop<T: ?Sized> {
+   |            ^^^^^^^^^^^^
 note: required because it appears within the type `MaybeUninit<PhantomData<*const ()>>`
   --> $RUST/core/src/mem/maybe_uninit.rs
+   |
+   | pub union MaybeUninit<T> {
+   |           ^^^^^^^^^^^
    = note: required because it appears within the type `[MaybeUninit<PhantomData<*const ()>>; 4]`
-note: required because it appears within the type `VecInner<[MaybeUninit<PhantomData<*const ()>>; 4]>`
+note: required because it appears within the type `heapless::vec::VecInner<[MaybeUninit<PhantomData<*const ()>>; 4]>`
   --> $HEAPLESS/src/vec.rs
    |
    | pub struct VecInner<B: ?Sized + VecDrop> {
@@ -103,10 +130,19 @@ error[E0277]: `*const ()` cannot be sent between threads safely
    = help: within `HistoryBuffer<PhantomData<*const ()>, 4>`, the trait `Send` is not implemented for `*const ()`
 note: required because it appears within the type `PhantomData<*const ()>`
   --> $RUST/core/src/marker.rs
+   |
+   | pub struct PhantomData<T: ?Sized>;
+   |            ^^^^^^^^^^^
 note: required because it appears within the type `ManuallyDrop<PhantomData<*const ()>>`
   --> $RUST/core/src/mem/manually_drop.rs
+   |
+   | pub struct ManuallyDrop<T: ?Sized> {
+   |            ^^^^^^^^^^^^
 note: required because it appears within the type `MaybeUninit<PhantomData<*const ()>>`
   --> $RUST/core/src/mem/maybe_uninit.rs
+   |
+   | pub union MaybeUninit<T> {
+   |           ^^^^^^^^^^^
    = note: required because it appears within the type `[MaybeUninit<PhantomData<*const ()>>; 4]`
 note: required because it appears within the type `HistoryBuffer<PhantomData<*const ()>, 4>`
   --> $HEAPLESS/src/histbuf.rs

src/binary_heap.rs

@@ -564,9 +564,13 @@ where
 
 #[cfg(test)]
 mod tests {
-    use std::vec::Vec;
+    use static_assertions::assert_not_impl_any;
 
-    use crate::binary_heap::{BinaryHeap, Max, Min};
+    use super::{BinaryHeap, Max, Min};
+
+    // Ensure a `BinaryHeap` containing `!Send` values stays `!Send` itself.
+    assert_not_impl_any!(BinaryHeap<*const (), Max, 4>: Send);
+    assert_not_impl_any!(BinaryHeap<*const (), Min, 4>: Send);
 
     #[test]
     fn static_new() {

src/indexmap.rs

@@ -2,7 +2,6 @@ use core::{
     borrow::Borrow,
     fmt,
     hash::{BuildHasher, Hash},
-    iter::FromIterator,
     mem,
     num::NonZeroU32,
     ops, slice,

src/indexset.rs

@@ -3,7 +3,6 @@ use core::{
     borrow::Borrow,
     fmt,
     hash::{BuildHasher, Hash},
-    iter::FromIterator,
 };
 use hash32::{BuildHasherDefault, FnvHasher};
 

src/linear_map.rs

@@ -1,5 +1,5 @@
 use crate::Vec;
-use core::{borrow::Borrow, fmt, iter::FromIterator, mem, ops, slice};
+use core::{borrow::Borrow, fmt, mem, ops, slice};
 
 /// A fixed capacity map/dictionary that performs lookups via linear search.
 ///

src/string.rs

@@ -733,7 +733,6 @@ impl_try_from_num!(u64, 20);
 #[cfg(test)]
 mod tests {
     use crate::{String, Vec};
-    use core::convert::TryFrom;
 
     #[test]
     fn static_new() {

src/vec.rs

@@ -1,7 +1,6 @@
 use core::{
     cmp::Ordering,
     fmt, hash,
-    iter::FromIterator,
     mem,
     mem::{ManuallyDrop, MaybeUninit},
     ops, ptr, slice,