From: Andrew Reynolds <andrew.j.reynolds@gmail.com>
Date: Mon, 25 Sep 2017 21:42:02 +0000 (-0500)
Subject: Fix bug related to sort inference + subtypes. (#1125)
X-Git-Tag: cvc5-1.0.0~5619
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=aab07a32ae755d343bec226a746367e35b86098a;p=cvc5.git

Fix bug related to sort inference + subtypes. (#1125)
---

diff --git a/src/theory/sort_inference.cpp b/src/theory/sort_inference.cpp
index 73a50bc7a..b469ac9d0 100644
--- a/src/theory/sort_inference.cpp
+++ b/src/theory/sort_inference.cpp
@@ -540,7 +540,8 @@ TypeNode SortInference::getTypeForId( int t ){
 }
 
 Node SortInference::getNewSymbol( Node old, TypeNode tn ){
-  if( tn.isNull() || tn==old.getType() ){
+  // if no sort was inferred for this node, return original
+  if( tn.isNull() || tn.isComparableTo( old.getType() ) ){
     return old;
   }else if( old.isConst() ){
     //must make constant of type tn
diff --git a/test/regress/regress0/Makefile.am b/test/regress/regress0/Makefile.am
index dbff6cff1..5000be7a2 100644
--- a/test/regress/regress0/Makefile.am
+++ b/test/regress/regress0/Makefile.am
@@ -70,7 +70,8 @@ SMT2_TESTS = \
 	hung13sdk_output2.smt2 \
 	declare-funs.smt2 \
 	declare-fun-is-match.smt2 \
-	non-fatal-errors.smt2
+	non-fatal-errors.smt2 \
+	sqrt2-sort-inf-unk.smt2
 
 # Regression tests for PL inputs
 CVC_TESTS = \
diff --git a/test/regress/regress0/sqrt2-sort-inf-unk.smt2 b/test/regress/regress0/sqrt2-sort-inf-unk.smt2
new file mode 100644
index 000000000..f4b15020a
--- /dev/null
+++ b/test/regress/regress0/sqrt2-sort-inf-unk.smt2
@@ -0,0 +1,6 @@
+; COMMAND-LINE: --sort-inference
+; EXPECT: unknown
+(set-logic QF_NRA)
+(declare-fun x () Real)
+(assert (= (* x x) 2.0))
+(check-sat)