…Const

…vel-doc, r=Dylan-DPC

Add lint when no doc is present at the crate-level

Follow-up of rust-lang#66267.

r? @kinnison

Replace some desc logic in librustc_lint with article_and_desc

r? @eddyb @Centril @matthewjasper

Followup to rust-lang#69674

Blocked on rust-lang#69498

Evaluate repeat expression lengths as late as possible

Fixes rust-lang#68567

r? @varkor

…atthewjasper

Make `needs_drop` less pessimistic on generators

Generators only have non-trivial drop logic when they may store (in upvars or across yields) a type that does.

This prevents generation of some unnecessary MIR in simple generators. There might be some impact on compile times, but this is probably limited in real-world applications.

~~This builds off of rust-lang#69814 since that contains some fixes that are made relevant by *this* PR (see rust-lang#69814 (comment) (this has been merged)

…r=estebank

Fix invalid suggestion on `&mut` iterators yielding `&` references

Fixes rust-lang#69789.

rustc suggested an invalid code when `&` reference from `&mut` iterator is mutated. The compiler knew we're mutating a value behind `&` reference, but as the assignment RHS is from desugaring, it could only see the iterator expression from source and inserted `mut` there.

r? @estebank

…k,wesleywiser

get rid of ConstPropUnsupported; use ZST marker structs instead

This gets rid of yet another machine-specific error variant.

r? @oli-obk

…r=nikomatsakis

Remove `ReClosureBound`

We now substitute external names for regions in the query response.

r? @nikomatsakis

…r=Centril

Account for bad placeholder types in where clauses

Fix rust-lang#70291. Follow up to rust-lang#69148.

…an-DPC

Clean up E0452 explanation

r? @Dylan-DPC