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rust/tests/ui/nll/unused-mut-issue-50343.rs

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//@ run-rustfix
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#![deny(unused_mut)]
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#![allow(unused_variables)] // for rustfix
fn main() {
vec![(42, 22)].iter().map(|(mut x, _y)| ()).count();
//~^ ERROR: variable does not need to be mutable
}