1C CoRR+poonceonce+Once
 2
 3(*
 4 * Result: Never
 5 *
 6 * Test of read-read coherence, that is, whether or not two successive
 7 * reads from the same variable are ordered.
 8 *)
 9
10{}
11
12P0(int *x)
13{
14	WRITE_ONCE(*x, 1);
15}
16
17P1(int *x)
18{
19	int r0;
20	int r1;
21
22	r0 = READ_ONCE(*x);
23	r1 = READ_ONCE(*x);
24}
25
26exists (1:r0=1 /\ 1:r1=0)