error[E0277]: the trait bound `LocatedTestError<'_>: FromExternalError<netgauze_locate::BinarySpan<&[u8]>, AError>` is not satisfied
  --> tests/trybuild/03-from-external-not-defined.rs:26:22
   |
26 |     let (buf, ret) = nom::combinator::map_res(be_u8, |_| Err(AError::A))(buf)?;
   |                      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ the trait `FromExternalError<netgauze_locate::BinarySpan<&[u8]>, AError>` is not implemented for `LocatedTestError<'_>`
   |
   = help: the trait `FromExternalError<netgauze_locate::BinarySpan<&[u8]>, TestError>` is implemented for `LocatedTestError<'_>`
   = help: for that trait implementation, expected `TestError`, found `AError`
note: required by a bound in `map_res`
  --> $CARGO/nom-7.1.3/src/combinator/mod.rs
   |
   | pub fn map_res<I: Clone, O1, O2, E: FromExternalError<I, E2>, E2, F, G>(
   |                                     ^^^^^^^^^^^^^^^^^^^^^^^^ required by this bound in `map_res`