error[E0277]: the trait bound `Bar: Document` is not satisfied
 --> tests/compiletest/trait/field_not_impl_document.rs:3:10
  |
3 | #[derive(Document)]
  |          ^^^^^^^^ the trait `Document` is not implemented for `Bar`
  |
  = note: this error originates in the derive macro `Document` (in Nightly builds, run with -Z macro-backtrace for more info)