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error[E0308]: mismatched types
--> $DIR/return_type_containing_closure.rs:3:5
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LL | vec!['a'].iter().map(|c| c)
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `()`, found `Map<Iter<'_, char>, ...>`
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= note: expected unit type `()`
found struct `Map<std::slice::Iter<'_, char>, [closure@$DIR/return_type_containing_closure.rs:3:26: 3:29]>`
help: consider using a semicolon here
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LL | vec!['a'].iter().map(|c| c);
| +
help: a return type might be missing here
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LL | fn foo() -> _ {
| ++++
error: aborting due to previous error
For more information about this error, try `rustc --explain E0308`.
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