type In struct {
	JPathExpr *JSONPath `parser:"@@"`
	ListExpr  *ListExpr `parser:"| @@"`
}

// Grammar for Operand:
//
// operand → multOp ( ("-" | "+") multOp )*
// multOp  → unary ( ("/" | "*" | "%") unary )*
// unary   → "-" unary | primary
// primary → Value | Variable | "(" expression ")"
//

// An Operand is a single term followed by an optional sequence of
// terms separated by +/-
type Operand struct {

//	{
//		outcode(int($1), &$2, 0, &$4);
//	}
	MOVW	M1, R1 // 40010800
	MOVV	M1, R1 // 40210800


//
// integer operations
// logical instructions
// shift instructions
// unary instructions
//
//	LADDW rreg ',' sreg ',' rreg
//	{
//		outcode(int($1), &$2, int($4), &$6);
//	}
	ADD	R5, R9, R10	// 01255020
	ADDU	R13, R14, R19	// 01cd9821
	ADDV	R5, R9, R10	// 0125502c

  }

  /** The 0-ary cartesian product is a single empty list. */
  public void testCartesianProduct_zeroary() {
    assertThat(cartesianProduct()).containsExactly(list());
  }

  /** A unary cartesian product is one list of size 1 for each element in the input set. */
  public void testCartesianProduct_unary() {
    assertThat(cartesianProduct(set(1, 2))).containsExactly(list(1), list(2));
  }