| #![warn(clippy::borrow_interior_mutable_const)] |
| #![allow(clippy::declare_interior_mutable_const, clippy::ref_in_deref)] |
| |
| use std::borrow::Cow; |
| use std::cell::Cell; |
| use std::fmt::Display; |
| use std::sync::atomic::{AtomicUsize, Ordering}; |
| use std::sync::Once; |
| |
| const ATOMIC: AtomicUsize = AtomicUsize::new(5); |
| const CELL: Cell<usize> = Cell::new(6); |
| const ATOMIC_TUPLE: ([AtomicUsize; 1], Vec<AtomicUsize>, u8) = ([ATOMIC], Vec::new(), 7); |
| const INTEGER: u8 = 8; |
| const STRING: String = String::new(); |
| const STR: &str = "012345"; |
| const COW: Cow<str> = Cow::Borrowed("abcdef"); |
| const NO_ANN: &dyn Display = &70; |
| static STATIC_TUPLE: (AtomicUsize, String) = (ATOMIC, STRING); |
| const ONCE_INIT: Once = Once::new(); |
| |
| trait Trait<T>: Copy { |
| type NonCopyType; |
| |
| const ATOMIC: AtomicUsize; |
| } |
| |
| impl Trait<u32> for u64 { |
| type NonCopyType = u16; |
| |
| const ATOMIC: AtomicUsize = AtomicUsize::new(9); |
| } |
| |
| fn main() { |
| ATOMIC.store(1, Ordering::SeqCst); //~ ERROR interior mutability |
| assert_eq!(ATOMIC.load(Ordering::SeqCst), 5); //~ ERROR interior mutability |
| |
| let _once = ONCE_INIT; |
| let _once_ref = &ONCE_INIT; //~ ERROR interior mutability |
| let _once_ref_2 = &&ONCE_INIT; //~ ERROR interior mutability |
| let _once_ref_4 = &&&&ONCE_INIT; //~ ERROR interior mutability |
| let _once_mut = &mut ONCE_INIT; //~ ERROR interior mutability |
| let _atomic_into_inner = ATOMIC.into_inner(); |
| // these should be all fine. |
| let _twice = (ONCE_INIT, ONCE_INIT); |
| let _ref_twice = &(ONCE_INIT, ONCE_INIT); |
| let _ref_once = &(ONCE_INIT, ONCE_INIT).0; |
| let _array_twice = [ONCE_INIT, ONCE_INIT]; |
| let _ref_array_twice = &[ONCE_INIT, ONCE_INIT]; |
| let _ref_array_once = &[ONCE_INIT, ONCE_INIT][0]; |
| |
| // referencing projection is still bad. |
| let _ = &ATOMIC_TUPLE; //~ ERROR interior mutability |
| let _ = &ATOMIC_TUPLE.0; //~ ERROR interior mutability |
| let _ = &(&&&&ATOMIC_TUPLE).0; //~ ERROR interior mutability |
| let _ = &ATOMIC_TUPLE.0[0]; //~ ERROR interior mutability |
| let _ = ATOMIC_TUPLE.0[0].load(Ordering::SeqCst); //~ ERROR interior mutability |
| let _ = &*ATOMIC_TUPLE.1; //~ ERROR interior mutability |
| let _ = &ATOMIC_TUPLE.2; |
| let _ = (&&&&ATOMIC_TUPLE).0; |
| let _ = (&&&&ATOMIC_TUPLE).2; |
| let _ = ATOMIC_TUPLE.0; |
| let _ = ATOMIC_TUPLE.0[0]; //~ ERROR interior mutability |
| let _ = ATOMIC_TUPLE.1.into_iter(); |
| let _ = ATOMIC_TUPLE.2; |
| let _ = &{ ATOMIC_TUPLE }; |
| |
| CELL.set(2); //~ ERROR interior mutability |
| assert_eq!(CELL.get(), 6); //~ ERROR interior mutability |
| |
| assert_eq!(INTEGER, 8); |
| assert!(STRING.is_empty()); |
| |
| let a = ATOMIC; |
| a.store(4, Ordering::SeqCst); |
| assert_eq!(a.load(Ordering::SeqCst), 4); |
| |
| STATIC_TUPLE.0.store(3, Ordering::SeqCst); |
| assert_eq!(STATIC_TUPLE.0.load(Ordering::SeqCst), 3); |
| assert!(STATIC_TUPLE.1.is_empty()); |
| |
| u64::ATOMIC.store(5, Ordering::SeqCst); //~ ERROR interior mutability |
| assert_eq!(u64::ATOMIC.load(Ordering::SeqCst), 9); //~ ERROR interior mutability |
| |
| assert_eq!(NO_ANN.to_string(), "70"); // should never lint this. |
| } |