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warning: unused closure that must be used
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--> $DIR/issue-1460.rs:6:6
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LL | {|i: u32| if 1 == i { }};
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| ^^^^^^^^^^^^^^^^^^^^^^
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= note: closures are lazy and do nothing unless called
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= note: `#[warn(unused_must_use)]` on by default
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warning: 1 warning emitted
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