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error[E0308]: mismatched types
--> $DIR/universe-violation.rs:13:31
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LL | let b: fn(&u32) -> &u32 = a;
| ^ one type is more general than the other
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= note: expected fn pointer `for<'r> fn(&'r u32) -> &'r u32`
found fn pointer `fn(&u32) -> &u32`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0308`.
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