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error[E0308]: mismatched types
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--> $DIR/liveness-closure-require-ret.rs:2:37
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LL | fn main() { println!("{}", force(|| {})); }
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| ^^ expected `isize`, found `()`
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error: aborting due to 1 previous error
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For more information about this error, try `rustc --explain E0308`.
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