How to temporarily prevent Rule1 from pushing value to stack?

[Cao Zhijun]

I have a Rule1 defined well, most of the times I need it to produce value to stack however sometimes I just want it to match and forget (no value pushed). How can I achieve this please? Must I copy code and define another Rule0 ? 

[Mathias Doenitz]

Cao,

you can simply follow it with `~ drop[Int]` for example, if the value you want to drop is an `Int`.
If you want to drop more than one value you can say something like `~ drop[Int :: String :: Double :: HNil]`.

Cheers,
Mathias

---
mat...@parboiled.org
http://www.parboiled.org

> On 10. 4 2016, at 17:10, Cao Zhijun <zhij...@gmail.com> wrote:
>
> I have a Rule1 defined well, most of the times I need it to produce value to stack however sometimes I just want it to match and forget (no value pushed). How can I achieve this please? Must I copy code and define another Rule0 ?
>

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