From: Claudio Sacerdoti Coen <claudio.sacerdoticoen@unibo.it>
Date: Tue, 16 Mar 2010 16:41:40 +0000 (+0000)
Subject: 1) intros cleans up the cache (because the context changes) and this means
X-Git-Tag: make_still_working~3007
X-Git-Url: http://matita.cs.unibo.it/gitweb/?a=commitdiff_plain;h=3dadfa509ace9184e5cf33a46d44c48c6fbed31b;hp=3dadfa509ace9184e5cf33a46d44c48c6fbed31b;p=helm.git

1) intros cleans up the cache (because the context changes) and this means
   that the case of an empty list of under_inspection is possible
2) every time we merge goals we need to remove the currently under inspection
   goal from the list
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