…=m-ou-se

Stabilize `core::slice::fill`

Tracking issue rust-lang#70758

Stabilizes the `core::slice::fill` API in Rust 1.50, adding a `memset` doc alias so people coming from C/C++ looking for this operation can find it in the docs. This API hasn't seen any changes since we changed the signature in rust-lang#71165, and it seems like the right time to propose stabilization. Thanks!

r? ``@m-ou-se``

or_patterns: implement :pat edition-specific behavior

cc rust-lang#54883 ``@joshtriplett``

This PR implements the edition-specific behavior of `:pat` wrt or-patterns, as determined by the crater runs and T-lang consensus in rust-lang#54883 (comment).

I believe this can unblock stabilization of or_patterns.

r? ``@petrochenkov``

…, r=RalfJung

Fix memory leak in test "mem::uninit_write_slice_cloned_no_drop"

This fixes rust-lang#80116. I replaced the `Rc` based method I was using with a type that panics when dropped.

…lcnr

Make BoundRegion have a kind of BoungRegionKind

Split from rust-lang#76814

Also includes making `replace_escaping_bound_vars` only return `T`

Going to r? ```@lcnr```
Feel free to reassign

…ring, r=GuillaumeGomez,jyn514

impl Default for LangString, replacing all_false by default

Fix rust-lang#80015

``@rustbot`` label C-cleanup  T-rustdoc  A-markdown-parsing