syntax_data: {"ast_node_type":"other","tokens":[{"end":47,"kind":"keyword","start":0,"text":"if"}]}
source_snippet:     if match ty.instantiate_identity().kind() {
context_before:     let ty = tcx.type_of(def_id);
context_after:         ty::FnDef(..) => tcx.fn_sig(def_id).instantiate_identity().c_variadic(),