error: unnecessary parentheses around type
  --> $DIR/issue-105061-should-lint.rs:11:13
   |
LL |     for<'b> (for<'a> fn(Inv<'a>)): Trait<'b>,
   |             ^                   ^
   |
note: the lint level is defined here
  --> $DIR/issue-105061-should-lint.rs:2:9
   |
LL | #![deny(warnings)]
   |         ^^^^^^^^
   = note: `#[deny(unused_parens)]` implied by `#[deny(warnings)]`
help: remove these parentheses
   |
LL -     for<'b> (for<'a> fn(Inv<'a>)): Trait<'b>,
LL +     for<'b> for<'a> fn(Inv<'a>): Trait<'b>,
   |

error: unnecessary parentheses around type
  --> $DIR/issue-105061-should-lint.rs:17:16
   |
LL |     (dyn Hello<(for<'b> fn(&'b ()))>): Hello<T>
   |                ^                  ^
   |
help: remove these parentheses
   |
LL -     (dyn Hello<(for<'b> fn(&'b ()))>): Hello<T>
LL +     (dyn Hello<for<'b> fn(&'b ())>): Hello<T>
   |

error: aborting due to 2 previous errors