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error[E0277]: `()` doesn't implement `std::fmt::Display`
--> $DIR/doesnt-satisfy.rs:6:17
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LL | fn bar() -> () {}
| ^^ `()` cannot be formatted with the default formatter
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= help: the trait `std::fmt::Display` is not implemented for `()`
= note: in format strings you may be able to use `{:?}` (or {:#?} for pretty-print) instead
note: required by a bound in `Foo::{opaque#0}`
--> $DIR/doesnt-satisfy.rs:2:22
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LL | fn bar() -> impl std::fmt::Display;
| ^^^^^^^^^^^^^^^^^ required by this bound in `Foo::{opaque#0}`
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0277`.
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