clippy::unnecessary_cast does not warn on basic usage

[frewsxcv]

Summary

When casting the result of a function to the same type, clippy::unnecessary_cast doesn't warn

Lint Name

clippy::unnecessary_cast

Reproducer

I tried this code:

fn foo() -> f32 { 0. }

fn main() {
    let num = foo() as f32;
}

I expected to see this happen: Warning that the cast is unnecessary

Instead, this happened: No warning

Version

No response

[TennyZhuang]

@bors claim

[xFrednet]

Issue actions are done with @rustbot. So @rustbot claim would have worked. Now I can assign you directly. :)