From 32fab21e95e1f33deac1b720cd91214b8fa31eb2 Mon Sep 17 00:00:00 2001
From: Maciej Suminski <maciej.suminski@cern.ch>
Date: Thu, 7 Jan 2016 11:11:04 +0100
Subject: [PATCH] ivl: Allow concatenating strings returned by function calls.

---
 elab_expr.cc | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/elab_expr.cc b/elab_expr.cc
index cb0be36ca..d4394c1cc 100644
--- a/elab_expr.cc
+++ b/elab_expr.cc
@@ -2838,7 +2838,7 @@ NetExpr* PEConcat::elaborate_expr(Design*des, NetScope*scope,
 	    concat->set(idx, parms[off+idx]);
       }
 
-      if (wid_sum == 0) {
+      if (wid_sum == 0 && expr_type_ != IVL_VT_STRING) {
 	    cerr << get_fileline() << ": error: Concatenation/replication "
 	         << "may not have zero width in this context." << endl;
 	    des->errors += 1;