syntax_data: {"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"fulfill_cx:"}]}
source_snippet:         fulfill_cx: &mut dyn TraitEngine<'tcx, E>,
context_before:         term: ty::Term<'tcx>,
context_after:     ) -> Result<ty::Term<'tcx>, Vec<E>> {