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error[E0308]: mismatched types
--> $DIR/region-multiple-lifetime-bounds-on-fns-where-clause.rs:22:56
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LL | let _: fn(&mut &isize, &mut &isize, &mut &isize) = a;
| ^ one type is more general than the other
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= note: expected fn pointer `for<'r, 's, 't0, 't1, 't2, 't3> fn(&'r mut &'s isize, &'t0 mut &'t1 isize, &'t2 mut &'t3 isize)`
found fn item `for<'r, 's, 't0> fn(&'r mut &isize, &'s mut &isize, &'t0 mut &isize) {a::<'_, '_, '_>}`
error: aborting due to previous error
For more information about this error, try `rustc --explain E0308`.
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