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error[E0412]: cannot find type `Oper` in this scope
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--> $DIR/issue-54966.rs:3:27
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LL | fn generate_duration() -> Oper<impl FnMut()> {}
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| ^^^^ not found in this scope
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error: aborting due to 1 previous error
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For more information about this error, try `rustc --explain E0412`.
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