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fix crash in explanation generation. Codeplex issue 181

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2015-02-24 17:34:38 -08:00
parent 8ea7a1905f
commit 64e2011d42
4 changed files with 6 additions and 4 deletions
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1
src/muz/rel/dl_relation_manager.cpp
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@ -734,6 +734,7 @@ namespace datalog {
relation_union_fn * relation_manager::mk_union_fn(const relation_base & tgt, const relation_base & src,
const relation_base * delta) {
TRACE("dl", tout << src.get_plugin().get_name() << " " << tgt.get_plugin().get_name() << "\n";);
relation_union_fn * res = tgt.get_plugin().mk_union_fn(tgt, src, delta);
if(!res && &tgt.get_plugin()!=&src.get_plugin()) {
res = src.get_plugin().mk_union_fn(tgt, src, delta);