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error[E0107]: missing generics for associated type `TestMut::Output`
--> $DIR/issue-80433.rs:21:47
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LL | fn test_simpler<'a>(dst: &'a mut impl TestMut<Output = &'a mut f32>)
| ^^^^^^ expected 1 lifetime argument
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note: associated type defined here, with 1 lifetime parameter: `'a`
--> $DIR/issue-80433.rs:7:10
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LL | type Output<'a>;
| ^^^^^^ --
help: add missing lifetime argument
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LL | fn test_simpler<'a>(dst: &'a mut impl TestMut<Output<'a> = &'a mut f32>)
| ++++
error: aborting due to previous error
For more information about this error, try `rustc --explain E0107`.
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