Vec: add a "View" that can mutate the vec and erase the const generic.

CHANGELOG.md

@@ -16,6 +16,7 @@ and this project adheres to [Semantic Versioning](http://semver.org/).
 - Added `Vec::spare_capacity_mut`.
 - Added `Extend` impls for `Deque`.
 - Added `Deque::make_contiguous`.
+- Added `VecView`, the `!Sized` version of `Vec`.
 
 ### Changed
 

cfail/ui/not-send.stderr

@@ -72,19 +72,19 @@ error[E0277]: `*const ()` cannot be sent between threads safely
 22 |     is_send::<Vec<NotSend, 4>>();
    |               ^^^^^^^^^^^^^^^ `*const ()` cannot be sent between threads safely
    |
-   = help: within `heapless::Vec<PhantomData<*const ()>, 4>`, the trait `Send` is not implemented for `*const ()`
+   = 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
 note: required because it appears within the type `ManuallyDrop<PhantomData<*const ()>>`
   --> $RUST/core/src/mem/manually_drop.rs
 note: required because it appears within the type `MaybeUninit<PhantomData<*const ()>>`
   --> $RUST/core/src/mem/maybe_uninit.rs
    = note: required because it appears within the type `[MaybeUninit<PhantomData<*const ()>>; 4]`
-note: required because it appears within the type `Vec<PhantomData<*const ()>, 4>`
+note: required because it appears within the type `VecInner<[MaybeUninit<PhantomData<*const ()>>; 4]>`
   --> $HEAPLESS/src/vec.rs
    |
-   | pub struct Vec<T, const N: usize> {
-   |            ^^^
+   | pub struct VecInner<B: ?Sized + VecDrop> {
+   |            ^^^^^^^^
 note: required by a bound in `is_send`
   --> ui/not-send.rs:14:8
    |

src/lib.rs

@@ -88,7 +88,14 @@ pub use indexmap::{
 pub use indexset::{FnvIndexSet, IndexSet, Iter as IndexSetIter};
 pub use linear_map::LinearMap;
 pub use string::String;
-pub use vec::Vec;
+
+// Workaround https://github.com/rust-lang/rust/issues/119015. This is required so that the methods on `VecView` and `Vec` are properly documented.
+// cfg(doc) prevents `VecInner` being part of the public API.
+// doc(hidden) prevents the `pub use vec::VecInner` from being visible in the documentation.
+#[cfg(doc)]
+#[doc(hidden)]
+pub use vec::VecInner as _;
+pub use vec::{Vec, VecView};
 
 #[macro_use]
 #[cfg(test)]