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error: opaque type's hidden type cannot be another opaque type from the same scope
--> $DIR/issue-70877.rs:31:12
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LL | return func(&"oof");
| ^^^^^^^^^^^^ one of the two opaque types used here has to be outside its defining scope
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note: opaque type whose hidden type is being assigned
--> $DIR/issue-70877.rs:28:19
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LL | fn oof(_: Foo) -> impl std::fmt::Debug {
| ^^^^^^^^^^^^^^^^^^^^
note: opaque type being used as hidden type
--> $DIR/issue-70877.rs:4:15
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LL | type FooRet = impl std::fmt::Debug;
| ^^^^^^^^^^^^^^^^^^^^
error: aborting due to 1 previous error
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