comparison lib/ur/option.urs @ 1421:3dab4696d116

Subqueries may always return NULL
author Adam Chlipala <adam@chlipala.net>
date Thu, 03 Feb 2011 21:04:12 -0500
parents 757dbac0454d
children a99b743a3087
comparison
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1420:146b69c53304 1421:3dab4696d116