From 99f1cfef36324f56923b696e16836bf5d14bfffb Mon Sep 17 00:00:00 2001
From: Christian Kamm <kamm@incasoftware.de>
Date: Tue, 29 Jul 2008 10:55:58 +0200
Subject: [PATCH] Error instead of assert on unimplemented interface functions.

---
 gen/classes.cpp | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/gen/classes.cpp b/gen/classes.cpp
index b368ee52..269c28cc 100644
--- a/gen/classes.cpp
+++ b/gen/classes.cpp
@@ -656,7 +656,11 @@ void DtoConstInitClass(ClassDeclaration* cd)
             {
                 Logger::println("interface vtbl const init nr. %d", k);
                 Dsymbol* dsym = (Dsymbol*)b->vtbl.data[k];
-                assert(dsym);
+
+                // error on unimplemented functions, error was already generated earlier
+                if(!dsym)
+                    fatal();
+
                 FuncDeclaration* fd = dsym->isFuncDeclaration();
                 assert(fd);
                 DtoForceDeclareDsymbol(fd);