Rollup of 5 pull requests#99407

Closed

Dylan-DPC wants to merge 13 commits intorust-lang:masterfrom

Dylan-DPC:rollup-nsvesnx

Commits on Jul 3, 2022

Add size assert in transmute_copy
5225225
committed

Commits on Jul 14, 2022

add missing null ptr check in alloc example
RalfJung
committed

Commits on Jul 16, 2022

Use LocalDefId in OpaqueTypeKey
compiler-errors
committed

Commits on Jul 17, 2022

interpret/visitor: add missing early return
RalfJung
committed