From: Mikko Rasa <tdb@tdb.fi>
Date: Tue, 30 Mar 2021 13:40:52 +0000 (+0300)
Subject: Add some precondition checks to Program
X-Git-Url: http://git.tdb.fi/?a=commitdiff_plain;h=fc5a3640bd7a007c2da025308e6d6a33402eb098;hp=fc5a3640bd7a007c2da025308e6d6a33402eb098;p=libs%2Fgl.git

Add some precondition checks to Program

Adding stages from multiple modules presents some difficulties in matching
the interfaces.
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