Rollup of 9 pull requests - #91016

Closed

JohnTitor wants to merge 23 commits into

rust-lang:masterfrom

JohnTitor:rollup-544ss6d

Commits on Nov 1, 2021

mention `remove` in `swap_remove`
r00ster91
committed
5f6cfd2

Commits on Nov 10, 2021

Commits on Nov 12, 2021

Add `-Zassert-incr-state` to assert state of incremental cache
pierwill
committed
1642fdf

Commits on Nov 14, 2021

require full validity when determining the discriminant of a value
RalfJung
committed
498ebc4

Commits on Nov 16, 2021

Remove unnecessary lifetime argument from arena macros.
nnethercote
committed
5520737
Add some comments.
nnethercote
committed
e73784d

Commits on Nov 17, 2021

Make slice->str conversion and related functions const
WaffleLapkin
committed
cf6f64a

Commits on Nov 18, 2021