Assert in debug mode that we do not try to compile a function literal...

src/codegen.cc

Index: src/codegen.cc
===================================================================
--- src/codegen.cc	(revision 1452)
+++ src/codegen.cc	(working copy)
@@ -237,6 +237,13 @@
 
 
 Handle<JSFunction> CodeGenerator::BuildBoilerplate(FunctionLiteral* node) {
+#ifdef DEBUG
+  // We should not try to compile the same function literal more than
+  // once.
+  ASSERT(!node->already_compiled());
+  node->mark_as_compiled();
+#endif
+
   // Determine if the function can be lazily compiled. This is
   // necessary to allow some of our builtin JS files to be lazily
   // compiled. These builtins cannot be handled lazily by the parser,