Given this simple sample

public delegate void DelegateType (GLib.Error? error);

public void f2(GLib.Error? error) {
	print("Delegate calling");
	if (error != null)
		print(error.message);
}

public void f1(DelegateType d) {
	d(null);
}

public static int main () {
	f1(f2);
	return 0;
}


This erroneous C code is generated:

static void _f2_delegate_type (GError* _error_, gpointer self) {
	f2 (error);
}

It fails to compile because the symbol _error_ mismatch.

According to git bisect, the commit which introduced this problem is

* cc9c261 Add TargetValue class

I could work on a patch until next week.