From: Dimitrios Vytiniotis <dimitris@microsoft.com>
Date: Wed, 18 May 2011 09:13:55 +0000 (+0100)
Subject: Fixes the way we check if flattening happened during
X-Git-Url: http://git.megacz.com/?p=ghc-hetmet.git;a=commitdiff_plain;h=b6264a6b8a8e22e24464da39ca0a3a0176d91f4e;hp=b6264a6b8a8e22e24464da39ca0a3a0176d91f4e

Fixes the way we check if flattening happened during
canonicalization. We now check whether the returned
coercion is an identity coercion. We used to check
whether we return any constraints from flattening but
that's wrong in the presence of the flattening cache.
---