Potential FN with `map_identity` lint

[fanninpm]

Lint name: map_identity

I tried this code: (Originally posted by @coolreader18 in RustPython/RustPython#2627 (comment))

        self.dict
            .entries
            .next_entry(&mut self.position)
            .map(|(key, value)| (key, value))

I expected to see this happen: Clippy recognizing that this map is an identity function.

Instead, this happened: Clippy has no comment.

Meta

• cargo clippy -V: clippy 0.1.52 (88f19c6 2021-05-03)
• rustc -Vv:

  rustc 1.46.0-nightly (f455e46ea 2020-06-20)
  binary: rustc
  commit-hash: f455e46eae1a227d735091091144601b467e1565
  commit-date: 2020-06-20
  host: x86_64-unknown-linux-gnu
  release: 1.46.0-nightly
  LLVM version: 10.0