[Haskell] Could not deduce .. why ?

[Jan Jakubuv]

hi,

2008/10/12 Marc Weber <marco-oweber at gmx.de>:
> Surely I've overseen a small point. But I can't see it:
>
> class AddEl el_ el2_ elc_ where
>  addEl :: el_ -> elc -> el2_ -- el, child

Did you mean "elc_" instead of "elc" in the type signature of addEl?

jan.