Bug path

‘test’: events 1-2

15	void test (void *ptr)
	^~~~
	\|
	(1) entry to ‘test’
16	{
17	two_frees (ptr, ptr);
	~~~~~~~~~~~~~~~~~~~~
	\|
	(2) calling ‘two_frees’ from ‘test’

‘two_frees’: events 3-5

6	two_frees (void p, void q)
	^~~~~~~~~
	\|
	(3) entry to ‘two_frees’
7	{
8	free (p);
	~~~~~~~~
	\|
	(4) first ‘free’ here
9	free (q); /* { dg-warning "double-'free' of 'q'" } */
	~~~~~~~~
	\|
	(5) second ‘free’ here; first ‘free’ was at (4)