GADT problems

Jason Dagit dagit at
Mon Sep 15 14:00:29 EDT 2008

On Mon, Sep 15, 2008 at 4:18 AM, Simon Peyton-Jones
<simonpj at> wrote:
> If you can suggest improvements to the manual I'm all ears.  Notably, it says nothing about what "rigid" means or how it propagates.

A good solid definition of rigid would be nice.  You pointed me at a
paper on wobbly types that I found to be quite helpful in my
understanding of the type checking issues.  The paper told me that
roughly speaking rigid means explicit.  Once I was armed with just
that information I started tackling more and more of these type check


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