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nll
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unused-mut-issue-50343.rs
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#![
feature
(
nll
)]
#![
deny
(
unused_mut
)]
fn
main
()
{
vec
![(
42
,
22
)].
iter
().
map
(|(
mut
x
,
_y
)|
()).
count
();
//~^ ERROR: variable does not need to be mutable
}