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error: item does not constrain `Foo::{opaque#0}`
--> $DIR/nested.rs:11:4
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LL | fn bar() -> Bar {
| ^^^
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= note: consider removing `#[define_opaque]` or adding an empty `#[define_opaque()]`
note: this opaque type is supposed to be constrained
--> $DIR/nested.rs:3:12
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LL | type Foo = impl std::fmt::Debug;
| ^^^^^^^^^^^^^^^^^^^^
error[E0277]: `Bar` doesn't implement `Debug`
--> $DIR/nested.rs:17:22
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LL | println!("{:?}", bar());
| ^^^^^ `Bar` cannot be formatted using `{:?}` because it doesn't implement `Debug`
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= help: the trait `Debug` is not implemented for `Bar`
= note: this error originates in the macro `$crate::format_args_nl` which comes from the expansion of the macro `println` (in Nightly builds, run with -Z macro-backtrace for more info)
error: aborting due to 2 previous errors
For more information about this error, try `rustc --explain E0277`.
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