error[E0277]: the trait bound `std::boxed::Box<dyn Foo>: Foo` is not satisfied
  --> $DIR/object-does-not-impl-trait.rs:6:35
   |
LL | fn take_foo<F:Foo>(f: F) {}
   | ------------------------ required by `take_foo`
LL | fn take_object(f: Box<dyn Foo>) { take_foo(f); }
   |                                   ^^^^^^^^ the trait `Foo` is not implemented for `std::boxed::Box<dyn Foo>`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0277`.