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error[E0308]: mismatched types
--> $DIR/region-lifetime-bounds-on-fns-where-clause.rs:20:43
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LL | let _: fn(&mut &isize, &mut &isize) = a;
| ^ one type is more general than the other
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= note: expected fn pointer `for<'a, 'b, 'c, 'd> fn(&'a mut &'b isize, &'c mut &'d isize)`
found fn item `for<'a, 'b> fn(&'a mut &isize, &'b mut &isize) {a::<'_, '_>}`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0308`.
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