code: func MakeVM() *VM {
  	return &VM{
  		MaxStack:       500,
  		ext:            make(vmExtMap),
  		tla:            make(vmExtMap),
  		nativeFuncs:    make(map[string]*NativeFunction),
  		ErrorFormatter: &termErrorFormatter{pretty: false, maxStackTraceSize: 20},
  		importer:       &FileImporter{},
  	}
  }
docs: // MakeVM creates a new VM with default parameters.