syntax_data: {"ast_node_type":"other","tokens":[{"end":84,"kind":"keyword","start":0,"text":"&GenericArgs::identity_for_item(tcx,"}]}
source_snippet:                     &GenericArgs::identity_for_item(tcx, def_id)[..trait_args_count]
context_before:                     let trait_args_count = tcx.generics_of(trait_def_id).count();
context_after:                 }