fix fenv error

runner/sandbox.go

@@ -130,25 +130,36 @@ func (s *Sandbox) registerCoreFunctions(state *luajit.State) error {
 
 // Execute runs a Lua script in the sandbox with the given context
 func (s *Sandbox) Execute(state *luajit.State, bytecode []byte, ctx *Context) (*Response, error) {
-	// Use CallGlobal for cleaner function calling
-	results, err := state.CallGlobal("__execute_script",
-		func() any {
+	// Load bytecode - pushes function onto stack
 	if err := state.LoadBytecode(bytecode, "script"); err != nil {
-				return nil
+		return nil, fmt.Errorf("failed to load bytecode: %w", err)
 	}
-			return "loaded_script"
-		}(),
-		ctx.Values)
 
-	if err != nil {
+	// Stack: [function]
+	state.GetGlobal("__execute_script") // Stack: [function, __execute_script]
+	state.PushCopy(-2)                  // Stack: [function, __execute_script, function]
+
+	// Push context using PushValue
+	if err := state.PushValue(ctx.Values); err != nil {
+		state.Pop(3)
+		return nil, fmt.Errorf("failed to push context: %w", err)
+	}
+	// Stack: [function, __execute_script, function, context]
+
+	// Call __execute_script(function, context)
+	if err := state.Call(2, 1); err != nil {
+		state.Pop(1) // Clean up original function
 		return nil, fmt.Errorf("script execution failed: %w", err)
 	}
+	// Stack: [function, result]
 
 	response := NewResponse()
-	if len(results) > 0 {
-		response.Body = results[0]
+	if result, err := state.ToValue(-1); err == nil {
+		response.Body = result
 	}
 
+	state.SetTop(0) // Clear stack
+
 	extractHTTPResponseData(state, response)
 	return response, nil
 }