Donald Bruce Stewart wrote:
Supposing a polymorphic value (of type, say, forall a . ExpT a t) is
stored inside an existential package (of type, say, forall a . Exp a),
I wonder how to recover a polymorphic value when eliminating the
existential. The ``natural way'' to write this doesn't work:
Redirected to haskell-cafe@haskell.org, the right list.
-- Don
- Forwarded message from Louis-Julien Guillemette [EMAIL PROTECTED] -
Date: Mon, 27 Nov 2006 16:15:26 -0500 (EST)
From: Louis-Julien Guillemette
Subject: [Haskell] polymorphism and existential types
Supposing a polymorphic
