error[E0271]: type mismatch resolving `<impl Pusherator<Item = u32> as Pusherator>::Item == (f64,)`
  --> tests/compile-fail/surface_demuxenum_wrongfields_1.rs:17:15
   |
17 |         ]) -> demux_enum::<Shape>();
   |               ^^^^^^^^^^^^^^^^^^^^^ expected `(f64,)`, found `u32`
   |
   = note: expected tuple `(f64,)`
               found type `u32`
note: required for `Shape` to implement `DemuxEnum<(impl Pusherator<Item = (f64,)>, impl Pusherator<Item = (f64, f64)>, impl Pusherator<Item = u32>)>`
  --> tests/compile-fail/surface_demuxenum_wrongfields_1.rs:5:14
   |
5  |     #[derive(DemuxEnum)]
   |              ^^^^^^^^^ unsatisfied trait bound introduced in this `derive` macro
6  |     enum Shape {
   |          ^^^^^
   = note: associated types for the current `impl` cannot be restricted in `where` clauses
   = note: associated types for the current `impl` cannot be restricted in `where` clauses
   = note: associated types for the current `impl` cannot be restricted in `where` clauses
   = note: this error originates in the derive macro `DemuxEnum` (in Nightly builds, run with -Z macro-backtrace for more info)