syntax_data: {"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":")"}]}
source_snippet:     ) -> RelateResult<'tcx, ty::GenericArgsRef<'tcx>> {
context_before:         b: ty::GenericArgsRef<'tcx>,
context_after:         relate_args_invariantly(relation, a, b)