Top rust issues

`repeat` method for (byte) slices?

C-tracking-issue T-libs disposition-merge

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HashMap using &str keys is not a a realistic example

C-enhancement T-doc

Symbols blow up binary size to an unreasonable degree on x86_64-unknown-linux-gnu

A-debuginfo A-linkage C-bug E-help-wanted E-mentor I-heavy O-linux

Tracking issue for RFC 1940: allow `#[must_use]` on functions

B-RFC-approved C-tracking-issue T-lang WG-compiler-front disposition-merge finished-final-comment-period

UnixStream doesn't support abstract addresses

C-feature-accepted T-libs

WebAssembly backend for rustc

C-tracking-issue O-wasm T-compiler

`#![deny(unsafe_op_in_unsafe_fn)]` in libstd

C-tracking-issue E-hard E-mentor F-unsafe-block-in-unsafe-fn libs-impl

It is hard to see the return types of async functions

A-async-await AsyncAwait-Triaged C-enhancement E-medium P-medium T-rustdoc

Breaking Change in Vec::truncate drop order between 1.40 -> 1.41

A-collections I-nominated T-libs regression-from-stable-to-stable