Comment in between argument type and argument name causes `Blank identifier error`
This code snippet causes problem
```
GLIB_AVAILABLE_IN_ALL
void      g_closure_invoke                      (GClosure       *closure,
                                                 GValue /*out*/ *return_value,
                                                 guint           n_param_values,
                                                 const GValue   *param_values,
                                                 gpointer        invocation_hint);
```

remove `/*out*/` fixes problem
```
GLIB_AVAILABLE_IN_ALL
void      g_closure_invoke                      (GClosure       *closure,
                                                 GValue *return_value,
                                                 guint           n_param_values,
                                                 const GValue   *param_values,
                                                 gpointer        invocation_hint);
```