13 fn try_acquire() {  in try_acquire()  function
16         let p1 = sem.try_acquire();  in try_acquire()
18         let p2 = sem.try_acquire();  in try_acquire()
21     let p3 = sem.try_acquire();  in try_acquire()
28     let p1 = sem.try_acquire().unwrap();  in acquire()
52         let p = sem.try_acquire().unwrap();  in forget()
58     assert!(sem.try_acquire().is_err());  in forget()
75     let _p1 = sem.try_acquire().unwrap();  in stresstest()
76     let _p2 = sem.try_acquire().unwrap();  in stresstest()
77     let _p3 = sem.try_acquire().unwrap();  in stresstest()
78     let _p4 = sem.try_acquire().unwrap();  in stresstest()
79     let _p5 = sem.try_acquire().unwrap();  in stresstest()
80     assert!(sem.try_acquire().is_err());  in stresstest()