extra_unused_type_parameters cannot be applied if fn is used

[matthiaskrgr]

Summary

.

Reproducer

I tried this code:

use std::backtrace::Backtrace;

#[inline(never)]
fn func_a() -> Backtrace {
    func_b::<u8>()
}
#[inline(never)]
fn func_b<T>() -> Backtrace {
	todo!();
}

fn main() {
    eprint!("{}", func_a());
}

Clippy will suggest to remove the parameter here

warning: type parameter `T` goes unused in function definition
 --> src/main.rs:8:10
  |
8 | fn func_b<T>() -> Backtrace {
  |          ^^^ help: consider removing the parameter
  |
  = help: for further information visit https://rust-lang.github.io/rust-clippy/master/index.html#extra_unused_type_parameters
  = note: `#[warn(clippy::extra_unused_type_parameters)]` on by default

but we still have a call of that function with the parameter in the code which prevent cargo fix from applying the change smoothly :/

If we --broken-code it, rustc will error but we can't apply the suggestion of the error unfortunately

error[E0107]: function takes 0 generic arguments but 1 generic argument was supplied
 --> src/main.rs:5:5
  |
5 |     func_b::<u8>()
  |     ^^^^^^------ help: remove these generics
  |     |
  |     expected 0 generic arguments
  |
note: function defined here, with 0 generic parameters
 --> src/main.rs:8:4
  |
8 | fn func_b() -> Backtrace {
  |    ^^^^^^

Could we make clippy walk through the function calls and suggest the removal of the param in an auto-applicable way there by itself?

Version

clippy 0.1.70 (87a2408 2023-04-11)

Additional Labels

No response