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error[E0308]: mismatched types
--> $DIR/illegal-upcast-from-impl.rs:16:66
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LL | fn illegal(x: &dyn Sub<Assoc = ()>) -> &dyn Super<Assoc = i32> { x }
| ----------------------- ^ expected trait `Super`, found trait `Sub`
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| expected `&dyn Super<Assoc = i32>` because of return type
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= note: expected reference `&dyn Super<Assoc = i32>`
found reference `&dyn Sub<Assoc = ()>`
error: aborting due to 1 previous error
For more information about this error, try `rustc --explain E0308`.
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