2023-07-02 07:35:19 -05:00
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#![deny(clippy::borrow_interior_mutable_const)]
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2020-11-23 06:51:04 -06:00
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#![allow(clippy::declare_interior_mutable_const)]
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// this file replicates its `declare` counterpart. Please see it for more discussions.
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use std::borrow::Cow;
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use std::cell::Cell;
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use std::sync::atomic::{AtomicUsize, Ordering};
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trait ConcreteTypes {
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const ATOMIC: AtomicUsize;
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const STRING: String;
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fn function() {
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2023-07-02 07:35:19 -05:00
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let _ = &Self::ATOMIC; //~ ERROR: interior mutability
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2020-11-23 06:51:04 -06:00
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let _ = &Self::STRING;
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}
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}
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impl ConcreteTypes for u64 {
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const ATOMIC: AtomicUsize = AtomicUsize::new(9);
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const STRING: String = String::new();
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fn function() {
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// Lint this again since implementers can choose not to borrow it.
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2023-07-02 07:35:19 -05:00
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let _ = &Self::ATOMIC; //~ ERROR: interior mutability
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2020-11-23 06:51:04 -06:00
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let _ = &Self::STRING;
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}
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}
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// a helper trait used below
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trait ConstDefault {
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const DEFAULT: Self;
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}
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trait GenericTypes<T, U> {
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const TO_REMAIN_GENERIC: T;
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const TO_BE_CONCRETE: U;
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fn function() {
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let _ = &Self::TO_REMAIN_GENERIC;
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}
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}
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impl<T: ConstDefault> GenericTypes<T, AtomicUsize> for Vec<T> {
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const TO_REMAIN_GENERIC: T = T::DEFAULT;
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const TO_BE_CONCRETE: AtomicUsize = AtomicUsize::new(11);
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fn function() {
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let _ = &Self::TO_REMAIN_GENERIC;
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2023-07-02 07:35:19 -05:00
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let _ = &Self::TO_BE_CONCRETE; //~ ERROR: interior mutability
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2020-11-23 06:51:04 -06:00
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}
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}
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// a helper type used below
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pub struct Wrapper<T>(T);
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trait AssocTypes {
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type ToBeFrozen;
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type ToBeUnfrozen;
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type ToBeGenericParam;
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const TO_BE_FROZEN: Self::ToBeFrozen;
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const TO_BE_UNFROZEN: Self::ToBeUnfrozen;
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const WRAPPED_TO_BE_UNFROZEN: Wrapper<Self::ToBeUnfrozen>;
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const WRAPPED_TO_BE_GENERIC_PARAM: Wrapper<Self::ToBeGenericParam>;
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fn function() {
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let _ = &Self::TO_BE_FROZEN;
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let _ = &Self::WRAPPED_TO_BE_UNFROZEN;
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}
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}
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impl<T: ConstDefault> AssocTypes for Vec<T> {
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type ToBeFrozen = u16;
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type ToBeUnfrozen = AtomicUsize;
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type ToBeGenericParam = T;
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const TO_BE_FROZEN: Self::ToBeFrozen = 12;
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const TO_BE_UNFROZEN: Self::ToBeUnfrozen = AtomicUsize::new(13);
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const WRAPPED_TO_BE_UNFROZEN: Wrapper<Self::ToBeUnfrozen> = Wrapper(AtomicUsize::new(14));
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const WRAPPED_TO_BE_GENERIC_PARAM: Wrapper<Self::ToBeGenericParam> = Wrapper(T::DEFAULT);
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fn function() {
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let _ = &Self::TO_BE_FROZEN;
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2023-07-02 07:35:19 -05:00
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let _ = &Self::TO_BE_UNFROZEN; //~ ERROR: interior mutability
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let _ = &Self::WRAPPED_TO_BE_UNFROZEN; //~ ERROR: interior mutability
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2020-11-23 06:51:04 -06:00
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let _ = &Self::WRAPPED_TO_BE_GENERIC_PARAM;
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}
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}
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// a helper trait used below
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trait AssocTypesHelper {
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type NotToBeBounded;
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type ToBeBounded;
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const NOT_TO_BE_BOUNDED: Self::NotToBeBounded;
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}
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trait AssocTypesFromGenericParam<T>
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where
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T: AssocTypesHelper<ToBeBounded = AtomicUsize>,
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{
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const NOT_BOUNDED: T::NotToBeBounded;
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const BOUNDED: T::ToBeBounded;
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fn function() {
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let _ = &Self::NOT_BOUNDED;
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2023-07-02 07:35:19 -05:00
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let _ = &Self::BOUNDED; //~ ERROR: interior mutability
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2020-11-23 06:51:04 -06:00
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}
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}
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impl<T> AssocTypesFromGenericParam<T> for Vec<T>
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where
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T: AssocTypesHelper<ToBeBounded = AtomicUsize>,
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{
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const NOT_BOUNDED: T::NotToBeBounded = T::NOT_TO_BE_BOUNDED;
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const BOUNDED: T::ToBeBounded = AtomicUsize::new(15);
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fn function() {
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let _ = &Self::NOT_BOUNDED;
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2023-07-02 07:35:19 -05:00
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let _ = &Self::BOUNDED; //~ ERROR: interior mutability
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2020-11-23 06:51:04 -06:00
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}
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}
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trait SelfType: Sized {
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const SELF: Self;
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const WRAPPED_SELF: Option<Self>;
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fn function() {
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let _ = &Self::SELF;
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let _ = &Self::WRAPPED_SELF;
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}
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}
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impl SelfType for u64 {
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const SELF: Self = 16;
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const WRAPPED_SELF: Option<Self> = Some(20);
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fn function() {
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let _ = &Self::SELF;
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let _ = &Self::WRAPPED_SELF;
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}
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}
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impl SelfType for AtomicUsize {
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const SELF: Self = AtomicUsize::new(17);
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const WRAPPED_SELF: Option<Self> = Some(AtomicUsize::new(21));
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fn function() {
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2023-07-02 07:35:19 -05:00
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let _ = &Self::SELF; //~ ERROR: interior mutability
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let _ = &Self::WRAPPED_SELF; //~ ERROR: interior mutability
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2020-11-23 06:51:04 -06:00
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}
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}
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trait BothOfCellAndGeneric<T> {
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const DIRECT: Cell<T>;
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const INDIRECT: Cell<*const T>;
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fn function() {
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2024-05-02 10:26:44 -05:00
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let _ = &Self::DIRECT; //~ ERROR: interior mutability
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2023-07-02 07:35:19 -05:00
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let _ = &Self::INDIRECT; //~ ERROR: interior mutability
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2020-11-23 06:51:04 -06:00
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}
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}
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impl<T: ConstDefault> BothOfCellAndGeneric<T> for Vec<T> {
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const DIRECT: Cell<T> = Cell::new(T::DEFAULT);
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const INDIRECT: Cell<*const T> = Cell::new(std::ptr::null());
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fn function() {
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let _ = &Self::DIRECT; //~ ERROR: interior mutability
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2023-07-02 07:35:19 -05:00
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let _ = &Self::INDIRECT; //~ ERROR: interior mutability
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2020-11-23 06:51:04 -06:00
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}
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}
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struct Local<T>(T);
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impl<T> Local<T>
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where
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T: ConstDefault + AssocTypesHelper<ToBeBounded = AtomicUsize>,
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{
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const ATOMIC: AtomicUsize = AtomicUsize::new(18);
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const COW: Cow<'static, str> = Cow::Borrowed("tuvwxy");
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const GENERIC_TYPE: T = T::DEFAULT;
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const ASSOC_TYPE: T::NotToBeBounded = T::NOT_TO_BE_BOUNDED;
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const BOUNDED_ASSOC_TYPE: T::ToBeBounded = AtomicUsize::new(19);
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fn function() {
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2023-07-02 07:35:19 -05:00
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let _ = &Self::ATOMIC; //~ ERROR: interior mutability
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2020-11-23 06:51:04 -06:00
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let _ = &Self::COW;
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let _ = &Self::GENERIC_TYPE;
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let _ = &Self::ASSOC_TYPE;
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2023-07-02 07:35:19 -05:00
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let _ = &Self::BOUNDED_ASSOC_TYPE; //~ ERROR: interior mutability
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2020-11-23 06:51:04 -06:00
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}
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}
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fn main() {
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u64::ATOMIC.store(5, Ordering::SeqCst); //~ ERROR: interior mutability
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assert_eq!(u64::ATOMIC.load(Ordering::SeqCst), 9); //~ ERROR: interior mutability
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2020-11-23 06:51:04 -06:00
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}
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