Merge pull request #5415 from dearblue/unwind-mrb_protect

Introducing the `mrb_protect_raw()` API function

include/mruby/error.h

@@ -133,6 +133,14 @@ MRB_API mrb_value mrb_rescue_exceptions(mrb_state *mrb, mrb_func_t body, mrb_val
                                         mrb_func_t rescue, mrb_value r_data,
                                         mrb_int len, struct RClass **classes);
 
+typedef mrb_value mrb_protect_raw_func(mrb_state *mrb, void *userdata);
+
+/**
+ * This API function behaves like `mrb_protect()`.
+ * The advantage is that it avoids objectifying the user data.
+ */
+MRB_API mrb_value mrb_protect_raw(mrb_state *mrb, mrb_protect_raw_func *body, void *userdata, mrb_bool *error);
+
 MRB_END_DECL
 
 #endif  /* MRUBY_ERROR_H */