syntax_data: {"ast_node_type":"other","tokens":[{"end":49,"kind":"keyword","start":0,"text":"trait_pred:"}]}
source_snippet:         trait_pred: ty::PolyTraitPredicate<'tcx>,
context_before:         &mut self,
context_after:         proj_ty: Option<(DefId, ty::Binder<'tcx, Term<'tcx>>)>,