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error[E0308]: mismatched types
--> $DIR/call-boxed.rs:4:9
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LL | let mut x = 1i32;
| ---- expected due to this value
LL | let y = Box::new(|| 1);
| -- the found closure
LL | x = y;
| ^ expected `i32`, found struct `Box`
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= note: expected type `i32`
found struct `Box<[closure@$DIR/call-boxed.rs:3:22: 3:24]>`
help: use parentheses to call this closure
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LL | x = y();
| ++
error: aborting due to previous error
For more information about this error, try `rustc --explain E0308`.
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