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error[E0308]: mismatched types
--> $DIR/issue-82612-return-mutable-reference.rs:18:13
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LL | / if index < self.values.len() {
LL | | let value = unsafe { self.values.get_unchecked_mut(index) };
LL | | value.get_or_insert_with(func)
| | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ expected `()`, found `&mut V`
LL | | }
| |_________- expected this to be `()`
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= note: expected unit type `()`
found mutable reference `&mut V`
help: consider using a semicolon here
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LL | value.get_or_insert_with(func);
| +
help: consider using a semicolon here
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LL | };
| +
help: you might have meant to return this value
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LL | return value.get_or_insert_with(func);
| ++++++ +
error: aborting due to previous error
For more information about this error, try `rustc --explain E0308`.
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