From acb4ca8e47206edd08f1ab09ab06b64ec95606c2 Mon Sep 17 00:00:00 2001
From: Maciej Suminski <maciej.suminski@cern.ch>
Date: Fri, 4 Dec 2015 17:16:27 +0100
Subject: [PATCH] vhdlpp: More descriptive error message for a missing
 function.

---
 vhdlpp/expression_emit.cc | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/vhdlpp/expression_emit.cc b/vhdlpp/expression_emit.cc
index 8874da8e6..67104e13c 100644
--- a/vhdlpp/expression_emit.cc
+++ b/vhdlpp/expression_emit.cc
@@ -583,7 +583,10 @@ int ExpFunc::emit(ostream&out, Entity*ent, ScopeBase*scope)
 {
       int errors = 0;
 
-      ivl_assert(*this, def_);
+      if(!def_) {
+          cerr << get_fileline() << ": error: unknown function: " << name_ << endl;
+          return 1;
+      }
 
       // If this function has an elaborated definition, and if
       // that definition is in a package, then include the