code: func (pop *parsedOpcode) isDisabled() bool {
  	switch pop.opcode.value {
  	case OP_CAT:
  		return true
  	case OP_SUBSTR:
  		return true
  	case OP_LEFT:
  		return true
  	case OP_RIGHT:
  		return true
  	case OP_INVERT:
  		return true
  	case OP_AND:
  		return true
  	case OP_OR:
  		return true
  	case OP_XOR:
  		return true
  	case OP_2MUL:
  		return true
  	case OP_2DIV:
  		return true
  	case OP_MUL:
  		return true
  	case OP_DIV:
  		return true
  	case OP_MOD:
  		return true
  	case OP_LSHIFT:
  		return true
  	case OP_RSHIFT:
  		return true
  	default:
  		return false
  	}
  }
docs: // isDisabled returns whether or not the opcode is disabled and thus is always
  // bad to see in the instruction stream (even if turned off by a conditional).