When a type parameter shadows a primitive type, the error message
was non obvious. For example, given the file `file.rs`:

```rust
trait Parser<T> {
    fn parse(text: &str) -> Option<T>;
}

impl<bool> Parser<bool> for bool {
    fn parse(text: &str) -> Option<bool> {
        Some(true)
    }
}

fn main() {
    println!("{}", bool::parse("ok").unwrap_or(false));
}
```

The output was:

```bash
% rustc file.rs
error[E0308]: mismatched types
 --> file.rs:7:14
  |
7 |         Some(true)
  |              ^^^^ expected type parameter, found bool
  |
  = note: expected type `bool`
  = note:    found type `bool`

error: aborting due to previous error
```

We now show extra information about the type:

```bash
% rustc file.rs
error[E0308]: mismatched types
 --> file.rs:7:14
  |
7 |         Some(true)
  |              ^^^^ expected type parameter, found bool
  |
  = note: expected type `bool` (type parameter)
  = note:    found type `bool` (bool)

error: aborting due to previous error
```

Fixes #35030