syntax_data: {"ast_node_type":"other","tokens":[{"end":93,"kind":"keyword","start":0,"text":"pred.instantiate_supertrait(tcx,"}]}
source_snippet:                     pred.instantiate_supertrait(tcx, ty::Binder::dummy(inner_most_trait_ref))
context_before:                 .filter_map(move |(pred, _)| {
context_after:                         .as_trait_clause()