error[E0271]: type mismatch resolving `<Foo2 as Bar2>::Ok == ()`
  --> $DIR/point-at-type-on-obligation-failure.rs:14:5
   |
LL |     type Sibling: Bar2<Ok=Self::Ok>;
   |                        ----------- required by this bound in `Bar::Sibling`
...
LL |     type Sibling = Foo2;
   |     ^^^^^^^^^^^^^^^^^^^^ expected `()`, found `u32`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0271`.