error[E0226]: only a single explicit lifetime bound is permitted
  --> $DIR/region-bounds-on-objects-and-type-parameters.rs:21:26
   |
LL |     z: Box<dyn Is<'a>+'b+'c>,
   |                          ^^

error[E0478]: lifetime bound not satisfied
  --> $DIR/region-bounds-on-objects-and-type-parameters.rs:21:8
   |
LL |     z: Box<dyn Is<'a>+'b+'c>,
   |        ^^^^^^^^^^^^^^^^^^^^^
   |
note: lifetime parameter instantiated with the lifetime `'b` as defined here
  --> $DIR/region-bounds-on-objects-and-type-parameters.rs:11:15
   |
LL | struct Foo<'a,'b,'c> {
   |               ^^
note: but lifetime parameter must outlive the lifetime `'a` as defined here
  --> $DIR/region-bounds-on-objects-and-type-parameters.rs:11:12
   |
LL | struct Foo<'a,'b,'c> {
   |            ^^

error[E0392]: parameter `'c` is never used
  --> $DIR/region-bounds-on-objects-and-type-parameters.rs:11:18
   |
LL | struct Foo<'a,'b,'c> {
   |                  ^^ unused parameter
   |
   = help: consider removing `'c`, referring to it in a field, or using a marker such as `PhantomData`

error: aborting due to 3 previous errors

Some errors have detailed explanations: E0226, E0392, E0478.
For more information about an error, try `rustc --explain E0226`.