error[E0790]: cannot call associated function on trait without specifying the corresponding `impl` type
  --> $DIR/E0283.rs:30:21
   |
LL |     fn create() -> u32;
   |     ------------------- `Coroutine::create` defined here
...
LL |     let cont: u32 = Coroutine::create();
   |                     ^^^^^^^^^^^^^^^^^^^ cannot call associated function of trait
   |
help: use a fully-qualified path to one of the available implementations
   |
LL |     let cont: u32 = <Impl as Coroutine>::create();
   |                     ++++++++          +
LL |     let cont: u32 = <AnotherImpl as Coroutine>::create();
   |                     +++++++++++++++          +

error[E0283]: type annotations needed
  --> $DIR/E0283.rs:35:24
   |
LL |     let bar = foo_impl.into() * 1u32;
   |                        ^^^^
   |
note: multiple `impl`s satisfying `Impl: Into<_>` found
  --> $DIR/E0283.rs:17:1
   |
LL | impl Into<u32> for Impl {
   | ^^^^^^^^^^^^^^^^^^^^^^^
   = note: and another `impl` found in the `core` crate:
           - impl<T, U> Into<U> for T
             where U: From<T>;
help: try using a fully qualified path to specify the expected types
   |
LL |     let bar = <Impl as Into<T>>::into(foo_impl) * 1u32;
   |               ++++++++++++++++++++++++        ~

error: aborting due to 2 previous errors

Some errors have detailed explanations: E0283, E0790.
For more information about an error, try `rustc --explain E0283`.