1 #![warn(clippy::borrow_interior_mutable_const)]
2 #![allow(clippy::declare_interior_mutable_const, clippy::ref_in_deref)]
7 use std::sync::atomic::{AtomicUsize, Ordering};
10 const ATOMIC: AtomicUsize = AtomicUsize::new(5);
11 const CELL: Cell<usize> = Cell::new(6);
12 const ATOMIC_TUPLE: ([AtomicUsize; 1], Vec<AtomicUsize>, u8) = ([ATOMIC], Vec::new(), 7);
13 const INTEGER: u8 = 8;
14 const STRING: String = String::new();
15 const STR: &str = "012345";
16 const COW: Cow<str> = Cow::Borrowed("abcdef");
17 const NO_ANN: &dyn Display = &70;
18 static STATIC_TUPLE: (AtomicUsize, String) = (ATOMIC, STRING);
19 const ONCE_INIT: Once = Once::new();
21 trait Trait<T>: Copy {
24 const ATOMIC: AtomicUsize;
27 impl Trait<u32> for u64 {
28 type NonCopyType = u16;
30 const ATOMIC: AtomicUsize = AtomicUsize::new(9);
34 ATOMIC.store(1, Ordering::SeqCst); //~ ERROR interior mutability
35 assert_eq!(ATOMIC.load(Ordering::SeqCst), 5); //~ ERROR interior mutability
37 let _once = ONCE_INIT;
38 let _once_ref = &ONCE_INIT; //~ ERROR interior mutability
39 let _once_ref_2 = &&ONCE_INIT; //~ ERROR interior mutability
40 let _once_ref_4 = &&&&ONCE_INIT; //~ ERROR interior mutability
41 let _once_mut = &mut ONCE_INIT; //~ ERROR interior mutability
42 let _atomic_into_inner = ATOMIC.into_inner();
43 // these should be all fine.
44 let _twice = (ONCE_INIT, ONCE_INIT);
45 let _ref_twice = &(ONCE_INIT, ONCE_INIT);
46 let _ref_once = &(ONCE_INIT, ONCE_INIT).0;
47 let _array_twice = [ONCE_INIT, ONCE_INIT];
48 let _ref_array_twice = &[ONCE_INIT, ONCE_INIT];
49 let _ref_array_once = &[ONCE_INIT, ONCE_INIT][0];
51 // referencing projection is still bad.
52 let _ = &ATOMIC_TUPLE; //~ ERROR interior mutability
53 let _ = &ATOMIC_TUPLE.0; //~ ERROR interior mutability
54 let _ = &(&&&&ATOMIC_TUPLE).0; //~ ERROR interior mutability
55 let _ = &ATOMIC_TUPLE.0[0]; //~ ERROR interior mutability
56 let _ = ATOMIC_TUPLE.0[0].load(Ordering::SeqCst); //~ ERROR interior mutability
57 let _ = &*ATOMIC_TUPLE.1; //~ ERROR interior mutability
58 let _ = &ATOMIC_TUPLE.2;
59 let _ = (&&&&ATOMIC_TUPLE).0;
60 let _ = (&&&&ATOMIC_TUPLE).2;
61 let _ = ATOMIC_TUPLE.0;
62 let _ = ATOMIC_TUPLE.0[0]; //~ ERROR interior mutability
63 let _ = ATOMIC_TUPLE.1.into_iter();
64 let _ = ATOMIC_TUPLE.2;
65 let _ = &{ ATOMIC_TUPLE };
67 CELL.set(2); //~ ERROR interior mutability
68 assert_eq!(CELL.get(), 6); //~ ERROR interior mutability
70 assert_eq!(INTEGER, 8);
71 assert!(STRING.is_empty());
74 a.store(4, Ordering::SeqCst);
75 assert_eq!(a.load(Ordering::SeqCst), 4);
77 STATIC_TUPLE.0.store(3, Ordering::SeqCst);
78 assert_eq!(STATIC_TUPLE.0.load(Ordering::SeqCst), 3);
79 assert!(STATIC_TUPLE.1.is_empty());
81 u64::ATOMIC.store(5, Ordering::SeqCst); //~ ERROR interior mutability
82 assert_eq!(u64::ATOMIC.load(Ordering::SeqCst), 9); //~ ERROR interior mutability
84 assert_eq!(NO_ANN.to_string(), "70"); // should never lint this.