code: func (vm *Engine) DisasmPC() (string, error) {
  	scriptIdx, scriptOff, err := vm.curPC()
  	if err != nil {
  		return "", err
  	}
  	return vm.disasm(scriptIdx, scriptOff), nil
  }
docs: // DisasmPC returns the string for the disassembly of the opcode that will be
  // next to execute when Step() is called.