Auto merge of #36338 - estebank:primitive-shadow, r=jseyfried
Be more specific when type parameter shadows primitive type 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 a | = 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 a | = note: expected type `bool` (type parameter) = note: found type `bool` (bool) error: aborting due to previous error ``` Fixes #35030
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