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