Rollup of 4 pull requests#98075

Merged

bors merged 19 commits intorust-lang:masterfrom

JohnTitor:rollup-nqwodnk

Jun 14, 2022

Commits on May 25, 2022

Add WIP stable MIR crate
oli-obk
committed
Add instructions
oli-obk
committed
Add additional crates to `very_unstable

xldenis
authored and
oli-obk
committed

Commits on May 29, 2022

Harden bad placeholder checks on statics/consts

JohnTitor
and
FabianWolff
committed

Commits on Jun 12, 2022

Improves parser diagnostics, fixes #93867
terrarier2111
committed