When this gate is enabled, explicit generic arguments can be specified even
if `impl Trait` is used in argument position. Generic arguments can only be
specified for explicit generic parameters but not for the synthetic type
parameters from  `impl Trait`

…ackh726

Implement a `explicit_generic_args_with_impl_trait` feature gate

Implements rust-lang#83701

When this gate is enabled, explicit generic arguments can be specified even if `impl Trait` is used in argument position. Generic arguments can only be specified for explicit generic parameters but not for the synthetic type parameters from  `impl Trait`

So code like this will be accepted:
```rust
#![feature(explicit_generic_args_with_impl_trait)]

fn foo<T: ?Sized>(_f: impl AsRef<T>) {}
fn main() {
    foo::<str>("".to_string());
}
```

…oc, r=scottmcm

Add documentation for the order of Option and Result

This resolves issue rust-lang#87238.

Fix invalid suggestions for non-ASCII characters in byte constants

Fixes rust-lang#87397.

…dtwco

Tweak opaque type mismatch error

Inline some macros

I factored out some macros that are not really necessary.

…, r=Mark-Simulacrum

Add missing "allocated object" doc link to `<*mut T>::add`

The portion of the documentation expecting the link was already there, but it was rendered as "[allocated object]". The added reference is just copied from the documentation for `<*const T>::add`.