Avoid silencing relevant follow-up errors
r? `@matthewjasper`
This PR only adds new errors to tests that are already failing and fixes one ICE.
Several tests were changed to not emit new errors. I believe all of them were faulty tests, and not explicitly testing for the code that had new errors.
Clean up `check_consts` and misc fixes
1. Remove most of the logic around erroring with trait methods. I have kept the part resolving it to a concrete impl, as that is used for const stability checks.
2. Turning on `effects` causes ICE with generic args, due to `~const Tr` when `Tr` is not `#[const_trait]` tripping up expectation in code that handles generic args, more specifically here:
8681e077b8/compiler/rustc_hir_analysis/src/astconv/generics.rs (L377)
We set `arg_count.correct` to `Err` to correctly signal that an error has already been reported.
3. UI test blesses.
Edit(fmease): Fixes#117244 (UI test is in #119099 for now).
r? compiler-errors
Remove `#[rustc_host]`, use internal desugaring
Also removed a way for users to explicitly specify the host param since that isn't particularly useful. This should eliminate any pain with encoding attributes across crates and etc.
r? `@compiler-errors`
Deny more `~const` trait bounds
thereby fixing a family of ICEs (delayed bugs) for `feature(const_trait_impl, effects)` code.
As discussed
r? `@fee1-dead`
Previously, any associated function could have `~const` trait bounds on
generic parameters, which could lead to ICEs when these bounds were used
on associated functions of non-`#[const_trait] trait` or
non-`impl const` blocks.
Includes changes as per @fee1-dead's comments in #116210.
