From 51824dbdc2a8c19cbae7c76826732ae2f319111d Mon Sep 17 00:00:00 2001
From: Andrew Reynolds <andrew.j.reynolds@gmail.com>
Date: Mon, 9 Apr 2018 15:29:08 -0500
Subject: [PATCH] Fix sygus substr static symmetry breaking (#1761)

---
 src/theory/quantifiers/sygus/term_database_sygus.cpp | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/src/theory/quantifiers/sygus/term_database_sygus.cpp b/src/theory/quantifiers/sygus/term_database_sygus.cpp
index 5c073aa0d..c8d7bf04d 100644
--- a/src/theory/quantifiers/sygus/term_database_sygus.cpp
+++ b/src/theory/quantifiers/sygus/term_database_sygus.cpp
@@ -555,7 +555,8 @@ bool TermDbSygus::considerConst( const Datatype& pdt, TypeNode tnp, Node c, Kind
         }
       }
     }else if( pk==STRING_SUBSTR ){
-      if( c==one_c ){
+      if (c == one_c && arg == 2)
+      {
         rt.d_req_kind = STRING_CHARAT;
         rt.d_children[0].d_req_type = getArgType( pdt[pc], 0 );
         rt.d_children[1].d_req_type = getArgType( pdt[pc], 1 );
-- 
2.30.2