const go/types._UndefinedOp

3 uses

	go/types (current package)
		errorcodes.go#L419: 	_UndefinedOp
		expr.go#L77: 			check.invalidOp(x, _UndefinedOp, "operator %s not defined on %s", op, x)
		expr.go#L762: 	code = _UndefinedOp