syntax_data: {"ast_node_type":"other","tokens":[{"end":46,"kind":"keyword","start":0,"text":"trait_ref:"}]}
source_snippet:     trait_ref: ty::Binder<I, ty::TraitRef<I>>,
context_before:     cx: I,
context_after: ) -> FilterToTraits<I, Elaborator<I, I::Clause>> {