DeclareContextSlot took an extra completely random argument from the...

src/codegen-ia32.cc

 // Copyright 2006-2008 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 1717 matching lines @@
     // Note: For variables we must not push an initial value (such as
     // 'undefined') because we may have a (legal) redeclaration and we
     // must not destroy the current value.
     if (node->mode() == Variable::CONST) {
       __ push(Immediate(Factory::the_hole_value()));
     } else if (node->fun() != NULL) {
       Load(node->fun());
     } else {
       __ push(Immediate(0));  // no initial value!
     }
-    __ CallRuntime(Runtime::kDeclareContextSlot, 5);
-    // DeclareContextSlot pops the assigned value by accepting an
-    // extra argument and returning the TOS; no need to explicitly
-    // pop here.
-    __ push(eax);
+    __ CallRuntime(Runtime::kDeclareContextSlot, 4);
+    // Ignore the return value (declarations are statements).
     return;
   }
 
   ASSERT(!var->is_global());
 
   // If we have a function or a constant, we need to initialize the variable.
   Expression* val = NULL;
   if (node->mode() == Variable::CONST) {
     val = new Literal(Factory::the_hole_value());
   } else {
@@ skipping 3596 matching lines @@
                                      bool is_eval) {
   Handle<Code> code = Ia32CodeGenerator::MakeCode(fun, script, is_eval);
   if (!code.is_null()) {
     Counters::total_compiled_code_size.Increment(code->instruction_size());
   }
   return code;
 }
 
 
 } }  // namespace v8::internal