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error: opaque type's hidden type cannot be another opaque type from the same scope
--> $DIR/two_tait_defining_each_other.rs:17:5
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LL | x // A's hidden type is `Bar`, because all the hidden types of `B` are compared with each other
| ^ 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/two_tait_defining_each_other.rs:9:10
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LL | type B = impl Foo;
| ^^^^^^^^
note: opaque type being used as hidden type
--> $DIR/two_tait_defining_each_other.rs:8:10
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LL | type A = impl Foo;
| ^^^^^^^^
error: aborting due to 1 previous error
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