error[E0382]: use of moved value: `b`
  --> $DIR/borrowck-consume-upcast-box.rs:10:13
   |
LL | fn foo(b: Box<dyn Foo + Send>) {
   |        - move occurs because `b` has type `Box<dyn Foo + Send>`, which does not implement the `Copy` trait
LL |     consume(b);
   |             - value moved here
LL |     consume(b);
   |             ^ value used here after move
   |
note: consider changing this parameter type in function `consume` to borrow instead if owning the value isn't necessary
  --> $DIR/borrowck-consume-upcast-box.rs:5:15
   |
LL | fn consume(_: Box<dyn Foo>) {
   |    -------    ^^^^^^^^^^^^ this parameter takes ownership of the value
   |    |
   |    in this function

error: aborting due to 1 previous error

For more information about this error, try `rustc --explain E0382`.