error[E0277]: cannot add `NonConstAdd` to `NonConstAdd` in const contexts
  --> $DIR/assoc-type.rs:19:16
   |
LL |     type Bar = NonConstAdd;
   |                ^^^^^^^^^^^ no implementation for `NonConstAdd + NonConstAdd`
   |
   = help: the trait `~const Add` is not implemented for `NonConstAdd`
note: the trait `Add` is implemented for `NonConstAdd`, but that implementation is not `const`
  --> $DIR/assoc-type.rs:19:16
   |
LL |     type Bar = NonConstAdd;
   |                ^^^^^^^^^^^
note: required by a bound in `Foo::Bar`
  --> $DIR/assoc-type.rs:15:15
   |
LL |     type Bar: ~const std::ops::Add;
   |               ^^^^^^^^^^^^^^^^^^^^ required by this bound in `Foo::Bar`

error: aborting due to previous error

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