Rollup of 4 pull requests#90802

Closed

matthiaskrgr wants to merge 8 commits intorust-lang:masterfrom

matthiaskrgr:rollup-mh6fstw

Commits on Nov 3, 2021

Make RawVec private to alloc
the8472
committed

Commits on Nov 9, 2021

Remove `rustc_incremental::persist::fs::dep_graph_path_from`
pierwill
committed

Commits on Nov 10, 2021

Fix trait object error code
asterycs
committed