error[E0599]: no variant named `Ellipse` found for enum `Shape`
  --> tests/compile-fail/surface_demuxenum_port_extra.rs:21:18
   |
6  |     enum Shape {
   |     ---------- variant `Ellipse` not found here
...
21 |         my_demux[Ellipse] -> for_each(std::mem::drop);
   |                  ^^^^^^^ variant not found in `Shape`

error[E0308]: mismatched types
  --> tests/compile-fail/surface_demuxenum_port_extra.rs:17:15
   |
17 |         ]) -> demux_enum::<Shape>();
   |               ^^^^^^^^^^^^^^^^^^^^^
   |               |
   |               expected a tuple with 3 elements, found one with 4 elements
   |               arguments to this function are incorrect
18 |         my_demux[Rectangle] -> for_each(std::mem::drop);
   |                                ------------------------ one of the found opaque types
19 |         my_demux[Circle] -> for_each(std::mem::drop);
   |                             ------------------------ one of the found opaque types
20 |         my_demux[Square] -> for_each(std::mem::drop);
   |                             ------------------------ one of the found opaque types
21 |         my_demux[Ellipse] -> for_each(std::mem::drop);
   |                              ------------------------ one of the found opaque types
   |
   = note: expected mutable reference `&mut (_, _, _)`
              found mutable reference `&mut (impl Pusherator<Item = _>, impl Pusherator<Item = _>, impl Pusherator<Item = _>, impl Pusherator<Item = _>)`
note: method defined here
  --> src/util/demux_enum.rs
   |
   |     fn demux_enum(self, outputs: &mut Outputs);
   |        ^^^^^^^^^^