Closes rust-lang#99255

These merged in rust-lang#97437 for 1.64.0, apart from the main `io_safety`
feature that stabilized in 1.63.0.

Fix type error

Fix continue_value doc comment

…t-generic-suffixes, r=petrochenkov

feat: omit suffixes in const generics (e.g. `1_i32`)

Closes rust-lang#99255

…-item, r=lcnr

Do not resolve associated const when there is no provided value

Fixes rust-lang#98629, since now we just delay a bug when we're not able to evaluate a const item due to the value not actually being provided by anything. This means compilation proceeds forward to where the "missing item in impl" error is emitted.

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The root issue here is that when we're looking for the defining `LeafDef` in `resolve_associated_item`, we end up getting the trait's AssocItem instead of the impl's AssocItem (which does not exist). This resolution "succeeds" even if the trait's item has no default value, and then since this item has no value to evaluate, it turns into a const eval error.

This root issue becomes problematic (as in rust-lang#98629) when this const eval error happens in wfcheck (for example, due to normalizing the param-env of something that references this const). Since this happens sooner than the check that an impl actually provides all of the items that a trait requires (which happens during later typecheck), we end up aborting compilation early with only this un-informative message.

I'm not exactly sure _why_ this bug arises due to rust-lang#96591 -- perhaps valtrees are evaluated more eagerly than in the old system?

r? `@oli-obk` or `@lcnr` since y'all are familiar with const eval and reviewed rust-lang#96591, though feel free to reassign.

This is a regression from stable to beta, so I would be open to considering this for beta backport. It seems correct to me, especially given the improvements in the other UI tests this PR touches, but may have some side-effects that I'm unaware of...?

…inators, r=scottmcm

Add map_continue and continue_value combinators to ControlFlow

As suggested in this comment: rust-lang#75744 (comment)

Related tracking issue: rust-lang#75744

r? `@scottmcm`

Fix the stable version of `AsFd for Arc<T>` and `Box<T>`

These merged in rust-lang#97437 for 1.64.0, apart from the main `io_safety`
feature that stabilized in 1.63.0.

couple of clippy::perf fixes