syntax_data: {"ast_node_type":"other","tokens":[{"end":34,"kind":"keyword","start":0,"text":"trait_ref:"}]}
source_snippet:     trait_ref: ty::TraitRef<'tcx>,
context_before:     tcx: TyCtxt<'tcx>,
context_after:     segment_visitor: impl FnMut(VtblSegment<'tcx>) -> ControlFlow<T>,