From: Andrew Reynolds <andrew.j.reynolds@gmail.com>
Date: Wed, 15 Apr 2020 08:02:50 +0000 (-0500)
Subject: Fix assertion in enumerative instantiation (#4313)
X-Git-Tag: cvc5-1.0.0~3366
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=94f8bafb38ccf380ace36259026a3b0959d13636;p=cvc5.git

Fix assertion in enumerative instantiation (#4313)

Fixes regress1.
---

diff --git a/src/theory/quantifiers/inst_strategy_enumerative.cpp b/src/theory/quantifiers/inst_strategy_enumerative.cpp
index 81ade68fc..6c17746ef 100644
--- a/src/theory/quantifiers/inst_strategy_enumerative.cpp
+++ b/src/theory/quantifiers/inst_strategy_enumerative.cpp
@@ -313,7 +313,8 @@ bool InstStrategyEnum::process(Node f, bool fullEffort, bool isRd)
                   << "  " << term_db_list[ftypes[i]][childIndex[i]]
                   << std::endl;
             }
-            Assert(terms[i].getType().isComparableTo(ftypes[i]));
+            Assert(terms[i].isNull()
+                   || terms[i].getType().isComparableTo(ftypes[i]));
           }
           if (ie->addInstantiation(f, terms))
           {