error[E0404]: expected trait, found type parameter `Add`
  --> $DIR/issue-35987.rs:5:21
   |
LL | use std::ops::Add;
   |               --- you might have meant to refer to this trait
LL |
LL | impl<T: Clone, Add> Add for Foo<T> {
   |                ---  ^^^ not a trait
   |                |
   |                found this type parameter

error[E0223]: ambiguous associated type
  --> $DIR/issue-35987.rs:9:32
   |
LL |     fn add(self, rhs: Self) -> Self::Output {
   |                                ^^^^^^^^^^^^
   |
help: use fully-qualified syntax
   |
LL |     fn add(self, rhs: Self) -> <Foo<T> as BitOr>::Output {
   |                                ~~~~~~~~~~~~~~~~~~~~~~~~~
LL |     fn add(self, rhs: Self) -> <Foo<T> as IntoFuture>::Output {
   |                                ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0223, E0404.
For more information about an error, try `rustc --explain E0223`.