Auto merge of #128439 - matthiaskrgr:rollup-m7ftgbi, r=matthiaskrgr #48626

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creating a shared reference to mutable static is discouraged

creating a mutable reference to mutable static is discouraged

trait `Bar` is never used

method `tr2` is never used

trait `IntoIteratorX` is never used

method `into_iter` is never used

method `dummy` is never used

unnecessary parentheses around assigned value

`#[track_caller]` on async functions is a no-op