syntax_data: {"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"(ty::Error(e),"}]}
source_snippet:         (ty::Error(e), _) | (_, ty::Error(e)) => {
context_before:     match (a.kind(), b.kind()) {
context_after:             infcx.set_tainted_by_errors(e);