… of opaque types."

This reverts commit 29a630e.

…in a cast

…ltiple-emits, r=jieyouxu

Migrate `run-make/multiple-emits` to `rmake.rs`

Part of rust-lang#121876.

r? `@jieyouxu`

…2, r=petrochenkov

Delegation: fix ICE on recursive delegation

fixes rust-lang#124347

r? `@petrochenkov`

…oalbini

Remove ignore-cross-compile directive from ui/macros/proc_macro

All the other proc-macro tests don't have this, presumably this was forgotten when the restriction got lifted as it does test just fine

r? `@pietroalbini`

Do not define opaque types when selecting impls

fixes rust-lang#126117

r? `@lcnr` for inconsistency with next solver

…r=oli-obk

interpret: ensure we check bool/char for validity when they are used in a cast

In general, `Scalar::to_bits` is a bit dangerous as it bypasses all type information. We should usually prefer matching on the type and acting according to that. So I also refactored `unary_op` handling of integers to do that. The remaining `to_bits` uses are operations that just fundamentally don't care about the sign (and only work on integers).

invalid_char_cast.rs is the key new test, the others already passed before this PR.

r? `@oli-obk`