error: lifetime may not live long enough
  --> $DIR/regions-infer-paramd-indirect.rs:22:9
   |
LL | impl<'a> SetF<'a> for C<'a> {
   |      -- lifetime `'a` defined here
...
LL |     fn set_f_bad(&mut self, b: Box<B>) {
   |                             - has type `Box<Box<&'1 isize>>`
LL |         self.f = b;
   |         ^^^^^^ assignment requires that `'1` must outlive `'a`

error: aborting due to 1 previous error