Re: a reliable way of dropping levity args?

As discussed on IRC, your approach below looks right to me: dropWhile (isLevityTy . idType) args. But you then said this wasn't working for you. What does (map idType args) say? Richard On Jan 24, 2016, at 8:58 PM, Ömer Sinan Ağacan wrote:

Hi all,

I'm looking for a reliable way of dropping levity args from TyCon applications. When I know that a particular TyCon gets some number of levity args, I can just drop the args manually (for example, I can drop the first half of arguments of a tuple TyCon application) but the code looks fragile (what happens if I use a different TyCon in the future) and confusing to the reader because it looks like this:

drop (length args `div` 2) args

Ideally it'd look like this:

dropWhile isLevityArg args

Now, there's a function called isLevityTy, but I don't understand what it's supposed to do. This doesn't do anyting to 'Boxed and 'Unboxed arguments:

dropWhile (isLevityArg . idType) args

Any ideas on this?

Thanks..