…xcrichton

- minimize bound check
- factorise operations
- use x, y, z instead of [f64, ..3]
- ~1.15 faster

Unify language configuration folding markers with server behaviour

Fixes rust-lang#14089.

…t-lang#14090)

Removing the `.as_ref()` or `.as_mut()` as the top-level expression in a
closure may change the type of the result. In this case, it may be
better not to lint rather than proposing a fix that would not work.

changelog: [`useless_asref`]: do not remove the `.as_ref()` or
`.as_mut()` call if this would change the type of the enclosing closure

Fix rust-lang#14088