[Haskell-cafe] Solved but strange error in type inference

[Yves Parès]

Brent is right. Separating functions is nicer to read and cleaner. Plus it
enhances testability.

> I wonder why the redeclared type variables cannot match those of legSome?
Try to put a totally wrong type to subsome, like
subsome :: Int
and tell us from the error what type is actually inferred.

2012/1/3 Yucheng Zhang <yczhang89 at gmail.com>

> On Wed, Jan 4, 2012 at 12:44 AM, Yves Parès <limestrael at gmail.com> wrote:
> > Remove subsome type signature. You are redeclaring type variables which
> > obviously cannot match those of legSome.
> > This cannot work without scoped type variables (and ad-hoc foralls to
> bring
> > them to scope, of course).
>
> That subsome type signature is from the original code.
>
> I wonder why the redeclared type variables cannot match those of legSome?
>
>
>
>
> p.s. I just realized that my changed code missed the line:
>
> > import qualified Data.Map as M
>
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