Lint for functions/variables/etc using the same name as a type (`str`, `u32`, ...)

Code

fn func(u32: u32) {
    println!("{u32}");
}

fn main() {
    let u32 = 42;
    func(u32);

    let closure = |str: &str| {
        println!("{}", str.len());
    };
    closure("hello");
}

Current output

(none)

Desired output

warning: variable `u32` should use a name that doesn't conflict with a standard type
 --> src/main.rs:1:9
  |
1 | fn func(u32: u32) {
  |         ^^^ help: rename the identifier

Rationale and extra context

It's confusing to read code where str (or another standard type name) is used as an identifier. It also produces misleading syntax highlighting.

Other cases

Rust Version

rustc 1.83.0 (90b35a623 2024-11-26)
binary: rustc
commit-hash: 90b35a6239c3d8bdabc530a6a0816f7ff89a0aaf
commit-date: 2024-11-26
host: x86_64-unknown-linux-gnu
release: 1.83.0
LLVM version: 19.1.1

Anything else?

No response

Start by reproducing the provided Rust example with rustc 1.83.0 and inspect how existing compiler lints handle identifiers that shadow types. Check the lint output for function parameters, local variables, and closure parameters, then add coverage for the requested cases. Done means the compiler emits the requested warning and the relevant tests pass.