Hi,

The following example produces uncompilable code:

public class GenericDelegate<T> : Object {
	public delegate T TestDelegate();
	public TestDelegate test_closure { get; set; }
}

public int main() {

	var test = new GenericDelegate<string> ();
	test.test_closure = () => { return "hi"; };
	print (test.test_closure());

	return 0;
}

valac says:
/home/quikee/Test.vala.c: In function ‘_lambda0_’:
/home/quikee/Test.vala.c:171: warning: assignment makes pointer from integer without a cast
/tmp/cc1AUEeh.o: In function `_lambda0_':
Test.vala.c:(.text+0x654): undefined reference to `t_dup_func'
collect2: ld returned 1 exit status
error: cc exited with status 256
Compilation failed: 1 error(s), 0 warning(s)

Second example is even worse.. it produces an error in valac:

public class GenericDelegate : Object {
	public delegate T TestDelegate<T> ();
	public TestDelegate test_closure { get; set; }
}

public int main() {

	var test = new GenericDelegate();
	test.test_closure = () => { return "hi"; };
	print (test.test_closure());

	return 0;
}

valac says:

# valac Test.vala 
**
ERROR:valasemanticanalyzer.c:2886:vala_semantic_analyzer_get_actual_type: assertion failed: (instance_type != NULL)
Aborted (core dumped)