Ensure `callee_id`s are body owners This PR makes the `callee_id` argument of Clippy's `implements_trait_with_env` optional, and when it is passed, ensures it is a body owner. #118661 added the `callee_id` parameter to alleviate an ICE. Specifically, the `callee_id` is used to determine an "effect arg" in certain situations. Frankly, I [do not completely understand](https://github.com/rust-lang/rust/pull/118661#discussion_r1449013176) what an "effect arg" is. But the code that determines it seems to require that `callee_id` is a body owner: - |
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