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Created by bob@bob131

Methods annotated [DestroysInstance] on non-compact classes do not receive an owned `this' reference

Some pseudocode:

class SomeClass : Object {
  [DestroysInstance]
  public void do_thing ();
}

...

some_class_instance.do_thing ();

Expected generated C code:

_tmpxx_ = some_class_instance;
some_class_instance = NULL;
some_class_do_thing (_tmpxx_);
_g_object_unref0 (some_class_instance);

or

_tmpxx_ = _g_object_ref0 (some_class_instance);
some_class_do_thing (_tmpxx_);
_g_object_unref0 (some_class_instance);

Actual generated C code:

some_class_do_thing (some_class_instance);
_g_object_unref0 (some_class_instance);

The above results in a double-unref.

This regression was introduced by 3d83f31a

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