1 #![feature(const_string_new, const_vec_new)]
2 #![allow(ref_in_deref, dead_code)]
4 use std::sync::atomic::{ATOMIC_USIZE_INIT, AtomicUsize, Ordering};
10 const ATOMIC: AtomicUsize = AtomicUsize::new(5); //~ ERROR interior mutable
11 const CELL: Cell<usize> = Cell::new(6); //~ ERROR interior mutable
12 const ATOMIC_TUPLE: ([AtomicUsize; 1], Vec<AtomicUsize>, u8) = ([ATOMIC], Vec::new(), 7);
13 //~^ ERROR interior mutable
15 macro_rules! declare_const {
16 ($name:ident: $ty:ty = $e:expr) => { const $name: $ty = $e; };
18 declare_const!(_ONCE: Once = Once::new()); //~ ERROR interior mutable
20 // const ATOMIC_REF: &AtomicUsize = &AtomicUsize::new(7); // This will simply trigger E0492.
22 const INTEGER: u8 = 8;
23 const STRING: String = String::new();
24 const STR: &str = "012345";
25 const COW: Cow<str> = Cow::Borrowed("abcdef");
26 //^ note: a const item of Cow is used in the `postgres` package.
28 const NO_ANN: &Display = &70;
30 static STATIC_TUPLE: (AtomicUsize, String) = (ATOMIC, STRING);
31 //^ there should be no lints on this line
33 #[allow(declare_interior_mutable_const)]
34 const ONCE_INIT: Once = Once::new();
36 trait Trait<T>: Copy {
39 const ATOMIC: AtomicUsize; //~ ERROR interior mutable
42 const SELF: Self; // (no error)
44 //~^ ERROR interior mutable
45 //~| HELP consider requiring `T` to be `Copy`
46 const ASSOC: Self::NonCopyType;
47 //~^ ERROR interior mutable
48 //~| HELP consider requiring `<Self as Trait<T>>::NonCopyType` to be `Copy`
50 const AN_INPUT: T = Self::INPUT;
51 //~^ ERROR interior mutable
52 //~| ERROR consider requiring `T` to be `Copy`
53 declare_const!(ANOTHER_INPUT: T = Self::INPUT); //~ ERROR interior mutable
60 //~^ ERROR interior mutable
61 //~| HELP consider requiring `Self` to be `Copy`
62 const ASSOC_2: Self::CopyType; // (no error)
65 // we don't lint impl of traits, because an impl has no power to change the interface.
66 impl Trait<u32> for u64 {
67 type NonCopyType = u16;
69 const ATOMIC: AtomicUsize = AtomicUsize::new(9);
70 const INTEGER: u64 = 10;
71 const STRING: String = String::new();
72 const SELF: Self = 11;
73 const INPUT: u32 = 12;
74 const ASSOC: Self::NonCopyType = 13;
77 struct Local<T, U>(T, U);
79 impl<T: Trait2 + Trait<u32>, U: Trait2> Local<T, U> {
80 const ASSOC_3: AtomicUsize = AtomicUsize::new(14); //~ ERROR interior mutable
81 const COW: Cow<'static, str> = Cow::Borrowed("tuvwxy");
82 const T_SELF: T = T::SELF_2;
83 const U_SELF: U = U::SELF_2;
84 //~^ ERROR interior mutable
85 //~| HELP consider requiring `U` to be `Copy`
86 const T_ASSOC: T::NonCopyType = T::ASSOC;
87 //~^ ERROR interior mutable
88 //~| HELP consider requiring `<T as Trait<u32>>::NonCopyType` to be `Copy`
89 const U_ASSOC: U::CopyType = U::ASSOC_2;
93 ATOMIC.store(1, Ordering::SeqCst); //~ ERROR interior mutability
94 assert_eq!(ATOMIC.load(Ordering::SeqCst), 5); //~ ERROR interior mutability
96 ATOMIC_USIZE_INIT.store(2, Ordering::SeqCst); //~ ERROR interior mutability
97 assert_eq!(ATOMIC_USIZE_INIT.load(Ordering::SeqCst), 0); //~ ERROR interior mutability
99 let _once = ONCE_INIT;
100 let _once_ref = &ONCE_INIT; //~ ERROR interior mutability
101 let _once_ref_2 = &&ONCE_INIT; //~ ERROR interior mutability
102 let _once_ref_4 = &&&&ONCE_INIT; //~ ERROR interior mutability
103 let _once_mut = &mut ONCE_INIT; //~ ERROR interior mutability
104 let _atomic_into_inner = ATOMIC.into_inner();
105 // these should be all fine.
106 let _twice = (ONCE_INIT, ONCE_INIT);
107 let _ref_twice = &(ONCE_INIT, ONCE_INIT);
108 let _ref_once = &(ONCE_INIT, ONCE_INIT).0;
109 let _array_twice = [ONCE_INIT, ONCE_INIT];
110 let _ref_array_twice = &[ONCE_INIT, ONCE_INIT];
111 let _ref_array_once = &[ONCE_INIT, ONCE_INIT][0];
113 // referencing projection is still bad.
114 let _ = &ATOMIC_TUPLE; //~ ERROR interior mutability
115 let _ = &ATOMIC_TUPLE.0; //~ ERROR interior mutability
116 let _ = &(&&&&ATOMIC_TUPLE).0; //~ ERROR interior mutability
117 let _ = &ATOMIC_TUPLE.0[0]; //~ ERROR interior mutability
118 let _ = ATOMIC_TUPLE.0[0].load(Ordering::SeqCst); //~ ERROR interior mutability
119 let _ = &*ATOMIC_TUPLE.1; //~ ERROR interior mutability
120 let _ = &ATOMIC_TUPLE.2;
121 let _ = (&&&&ATOMIC_TUPLE).0;
122 let _ = (&&&&ATOMIC_TUPLE).2;
123 let _ = ATOMIC_TUPLE.0;
124 let _ = ATOMIC_TUPLE.0[0]; //~ ERROR interior mutability
125 let _ = ATOMIC_TUPLE.1.into_iter();
126 let _ = ATOMIC_TUPLE.2;
127 let _ = &{ATOMIC_TUPLE};
129 CELL.set(2); //~ ERROR interior mutability
130 assert_eq!(CELL.get(), 6); //~ ERROR interior mutability
132 assert_eq!(INTEGER, 8);
133 assert!(STRING.is_empty());
136 a.store(4, Ordering::SeqCst);
137 assert_eq!(a.load(Ordering::SeqCst), 4);
139 STATIC_TUPLE.0.store(3, Ordering::SeqCst);
140 assert_eq!(STATIC_TUPLE.0.load(Ordering::SeqCst), 3);
141 assert!(STATIC_TUPLE.1.is_empty());
143 u64::ATOMIC.store(5, Ordering::SeqCst); //~ ERROR interior mutability
144 assert_eq!(u64::ATOMIC.load(Ordering::SeqCst), 9); //~ ERROR interior mutability
146 assert_eq!(NO_ANN.to_string(), "70"); // should never lint this.