const internal/types/errors.IncomparableMapKey

3 uses

	internal/types/errors (current package)
		code_string.go#L39: 	_ = x[IncomparableMapKey-28]
		codes.go#L291: 	IncomparableMapKey

	go/types
		typexpr.go#L367: 				check.errorf(e.Key, IncomparableMapKey, "invalid map key type %s%s", typ.key, why)