Add regression test for #11610 about mutable usage of argument in async function for the `needless_pass_by_ref_mut` lint Fixes https://github.com/rust-lang/rust-clippy/issues/11610. This was already fixed. I simply added a regression test. changelog: Add regression test for #11610 about mutable usage of argument in async function for the `needless_pass_by_ref_mut` lint