diff -r 7b32fc1bf153 -r be919b22085b src/BytecodeCompiler.cpp
--- a/src/BytecodeCompiler.cpp	Sun Jul 29 19:47:31 2012 -0700
+++ b/src/BytecodeCompiler.cpp	Mon Jul 30 00:03:46 2012 -0700
@@ -869,6 +869,9 @@
 void
 BytecodeCompiler::visit(FunctionStatement *node)
 {
+    if (!node->fun()->used())
+        return;
+
     if (node->fun()->isNative()) {
         assert(!moduleData_->natives->at(node->fun()->slot()));