…r if the check-cfg list is updated

…nst/static

…r-errors

suggest `into_iter()` when `Iterator` method called on `impl IntoIterator`

Fix for issue rust-lang#117711.

Avoid an ICE in diagnostics

fixes rust-lang#121004

just a slice usage in diagnostics code. Sadly we can't yet bubble the `ErrorGuaranteed` from wf check to borrowck for these cases, as that causes cycle errors iirc

… r=davidtwco

For E0038, suggest associated type if available

Closes rust-lang#116434

…rgau,Nilstrieb

Add clippy into the known `cfg` list

In clippy, we are removing the `feature = "cargo-clippy"` cfg to replace it with `clippy` in rust-lang/rust-clippy#12292. But for it to work, we need to declare `clippy` as cfg. It makes it more coherent with other existing tools like rustdoc.

cc `@flip1995`

allow mutable references in const values when they point to no memory

Fixes rust-lang#120450

The second commit is just some drive-by test suite cleanup.

r? `@oli-obk`

…_impls, r=cjgillot

Fix an ICE in the recursion lint

fixes rust-lang#121170

I looked into it, and there is no good path towards tainting mir_build (where the ICE happens), but using `try_normalize` in a lint seems generally better anyway