From 68da3cfd02ba81f108aacff1dede89006de1d818 Mon Sep 17 00:00:00 2001
From: Alan Mishchenko <alanmi@berkeley.edu>
Date: Sun, 11 Nov 2018 09:37:20 -0800
Subject: Added a passthrough in command 'fold' if there are no POs, only
 constraints.

---
 src/base/abci/abc.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/src/base/abci/abc.c b/src/base/abci/abc.c
index 2e86f61d..50bcfb26 100644
--- a/src/base/abci/abc.c
+++ b/src/base/abci/abc.c
@@ -27292,6 +27292,11 @@ int Abc_CommandFold( Abc_Frame_t * pAbc, int argc, char ** argv )
         Abc_Print( 0, "The network has no constraints.\n" );
         return 0;
     }
+    if ( Abc_NtkConstrNum(pNtk) == Abc_NtkPoNum(pNtk) )
+    {
+        Abc_Print( 0, "The network has no primary outputs (only constraints).\n" );
+        return 0;
+    }
     if ( Abc_NtkIsComb(pNtk) )
         Abc_Print( 0, "The network is combinational.\n" );
     // modify the current network
-- 
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