func NewFrame(s *util.Stack) *Frame {
f := &Frame{
util.NewFrame(s),
nil,
make(map[string]int),
}
return f
}
// PushFrame pushes a new frame to the frame stack
func (st *State) PushFrame() *util.Frame {
f := util.NewFrame(st.framestack)
st.frames.Push(f)
f.SetMark(st.frames.Cur())
return f
}