Co-authored-by: scottmcm <[email protected]>

"Subtree update" as well

Re-draft Deref docs

Make general advice more explicit and note the difference between
generic and specific implementations.

Re-draft DerefMut docs in-line with Deref

Fix Deref docs typos

Fix broken links

Clarify advice for specific-over-generic impls

Add comment addressing Issue rust-lang#73682

x fmt

Copy faillibility warning to DerefMut

…-Simulacrum

Deref docs: expand and remove "smart pointer" qualifier

**Ready for review**

~~This is an unpolished draft to be sanity-checked~~

Fixes rust-lang#91004

~~Comments on substance and content of this are welcome. This is deliberately unpolished until ready to review so please try to stay focused on the big-picture.~~

~~Once this has been sanity checked, I will similarly update `DerefMut` and polish for review.~~

Guarantee that `char` has the same size and alignment as `u32`

clarify that the str invariant is a safety, not validity, invariant

Updates these docs to match rust-lang/reference#792

…Simulacrum

triagebot no-merges: exclude different case

"Subtree update" as well

To address [this on zulip](https://rust-lang.zulipchat.com/#narrow/stream/242791-t-infra/topic/can't.20suppress.20merge.20commit.20warning)

cc `@bjorn3`

r? `@mark-simulacrum`

fallback for `construct_generic_bound_failure`

Fixes rust-lang#117547

This case regressed at rust-lang#115882.

In this context, `generic_param_scope` is produced by `RPITVisitor` and not included by `hir_owner`. Therefore, I've added a fallback to address this.

…ifetime, r=cjgillot

Remove `'tcx` lifetime on `PlaceholderConst`

The `'tcx` lifetime is not needed for anything, so this is a continuation of rust-lang#117139.