mortenbp/OpenGL — comment on commit 66957698c6dfee563a22d1868ab6cbb8402b34c3
File:  line 0
By dagit:

I'm trying to understand what this fixes. Did you get an error? If so, can you please share it?

The reason I ask is because, this has been working. To declare a Num instance you must also have an Eq instance and so `a` must already be an instance of Eq: http://www.haskell.org/onlinereport/basic.html#standard-numeric-types