Before you submit the issue, please provide us following information:

• Your operating system
  Windows 10
• How did you install Goby
  go get
• Goby version
  go.mod:

	github.com/goby-lang/goby v0.1.13

• The value of $GOBY_ROOT
  Reference go path location
• Error messages
  n/a

Usage:
I'm trying to introduce a variable. I am using "getExecresult()" but it's untested due to an issue providing GOBY_ROOT during test. -- I understand this is designed to be used as a stand alone executable. However I am trying to provide a Ruby-like environment for custom code / extensions to users.

	v, err := vm.New("./", []string{})
	if err != nil {
		return false, err
	}
	instructionSets, err := compiler.CompileToInstructions(code, parser.NormalMode)
	if err != nil {
		return false, err
	}
	dataObject := v.InitObjectFromGoType(data)
	v.GetExecResult().InstanceVariableSet("data", dataObject)
	v.ExecInstructions(instructionSets, "code.rb")
	return v.GetExecResult().Value() == true, nil