error[E0309]: the parameter type `T` may not live long enough
  --> $DIR/ty-param-fn.rs:9:5
   |
LL | fn no_region<'a, T>(x: Box<T>) -> Box<Debug + 'a>
   |              -- the parameter type `T` must be valid for the lifetime `'a` as defined here...
...
LL |     x
   |     ^ ...so that the type `T` will meet its required lifetime bounds
   |
help: consider adding an explicit lifetime bound
   |
LL |     T: Debug + 'a,
   |              ++++

error[E0309]: the parameter type `T` may not live long enough
  --> $DIR/ty-param-fn.rs:24:5
   |
LL | fn wrong_region<'a, 'b, T>(x: Box<T>) -> Box<Debug + 'a>
   |                 -- the parameter type `T` must be valid for the lifetime `'a` as defined here...
...
LL |     x
   |     ^ ...so that the type `T` will meet its required lifetime bounds
   |
help: consider adding an explicit lifetime bound
   |
LL |     T: 'b + Debug + 'a,
   |                   ++++

error: aborting due to 2 previous errors

For more information about this error, try `rustc --explain E0309`.