`indexing_slicing` should not trigger if the `get` method expects a different type

Summary

As implemented in #12488, the indexing_slicing lint checks if there's a get method before suggesting using it. However, it doesn't check if that method can be used with the type being used as the index.

Lint Name

indexing_slicing

Reproducer

I tried this code (simplified from the linearize docs):

use linearize::{Linearize, static_map};

#[derive(Linearize)]
enum Keys {
    A,
    B,
}

fn main() {
    let map = static_map! {
        Keys::A => "a",
        Keys::B => "b",
    };
    assert_eq!(map[Keys::A], "a");
}

I saw this happen:

    = help: consider using `.get(n)` or `.get_mut(n)` instead
    = help: for further information visit https://rust-lang.github.io/rust-clippy/rust-1.92.0/index.html#indexing_slicing

This is because StaticMap<Keys, &str> derefs to [&str], which has a get(usize) method. However, this cannot be used to index by something of type Keys, so I expected the lint not to trigger.

Version

Additional Labels

No response