error[E0308]: mismatched types
  --> $DIR/regions-infer-paramd-indirect.rs:22:18
   |
LL |         self.f = b;
   |                  ^ lifetime mismatch
   |
   = note: expected type `std::boxed::Box<std::boxed::Box<&'a isize>>`
              found type `std::boxed::Box<std::boxed::Box<&isize>>`
note: the anonymous lifetime #2 defined on the method body at 21:5...
  --> $DIR/regions-infer-paramd-indirect.rs:21:5
   |
LL | /     fn set_f_bad(&mut self, b: Box<B>) {
LL | |         self.f = b;
LL | |
LL | |
LL | |
LL | |
LL | |     }
   | |_____^
note: ...does not necessarily outlive the lifetime 'a as defined on the impl at 16:6
  --> $DIR/regions-infer-paramd-indirect.rs:16:6
   |
LL | impl<'a> SetF<'a> for C<'a> {
   |      ^^

error: aborting due to previous error

For more information about this error, try `rustc --explain E0308`.