syntax_data: {"ast_node_type":"other","tokens":[{"end":50,"kind":"keyword","start":0,"text":"(ty::Infer(_),"}]}
source_snippet:         (ty::Infer(_), _) | (_, ty::Infer(_)) => {
context_before:     match (a.kind(), b.kind()) {
context_after:             // The caller should handle these cases!