mirror of
https://github.com/rust-lang/rust-clippy
synced 2024-12-24 20:13:24 +00:00
93 lines
2.9 KiB
Rust
93 lines
2.9 KiB
Rust
#![warn(clippy::declare_interior_mutable_const)]
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use std::borrow::Cow;
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use std::cell::Cell;
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use std::fmt::Display;
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use std::sync::atomic::AtomicUsize;
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use std::sync::Once;
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const ATOMIC: AtomicUsize = AtomicUsize::new(5); //~ ERROR interior mutable
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const CELL: Cell<usize> = Cell::new(6); //~ ERROR interior mutable
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const ATOMIC_TUPLE: ([AtomicUsize; 1], Vec<AtomicUsize>, u8) = ([ATOMIC], Vec::new(), 7);
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//~^ ERROR interior mutable
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macro_rules! declare_const {
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($name:ident: $ty:ty = $e:expr) => {
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const $name: $ty = $e;
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};
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}
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declare_const!(_ONCE: Once = Once::new()); //~ ERROR interior mutable
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// const ATOMIC_REF: &AtomicUsize = &AtomicUsize::new(7); // This will simply trigger E0492.
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const INTEGER: u8 = 8;
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const STRING: String = String::new();
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const STR: &str = "012345";
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const COW: Cow<str> = Cow::Borrowed("abcdef");
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//^ note: a const item of Cow is used in the `postgres` package.
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const NO_ANN: &dyn Display = &70;
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static STATIC_TUPLE: (AtomicUsize, String) = (ATOMIC, STRING);
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//^ there should be no lints on this line
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#[allow(clippy::declare_interior_mutable_const)]
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const ONCE_INIT: Once = Once::new();
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trait Trait<T>: Copy {
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type NonCopyType;
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const ATOMIC: AtomicUsize; //~ ERROR interior mutable
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const INTEGER: u64;
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const STRING: String;
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const SELF: Self; // (no error)
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const INPUT: T;
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//~^ ERROR interior mutable
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//~| HELP consider requiring `T` to be `Copy`
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const ASSOC: Self::NonCopyType;
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//~^ ERROR interior mutable
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//~| HELP consider requiring `<Self as Trait<T>>::NonCopyType` to be `Copy`
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const AN_INPUT: T = Self::INPUT;
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//~^ ERROR interior mutable
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//~| ERROR consider requiring `T` to be `Copy`
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declare_const!(ANOTHER_INPUT: T = Self::INPUT); //~ ERROR interior mutable
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}
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trait Trait2 {
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type CopyType: Copy;
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const SELF_2: Self;
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//~^ ERROR interior mutable
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//~| HELP consider requiring `Self` to be `Copy`
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const ASSOC_2: Self::CopyType; // (no error)
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}
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// we don't lint impl of traits, because an impl has no power to change the interface.
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impl Trait<u32> for u64 {
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type NonCopyType = u16;
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const ATOMIC: AtomicUsize = AtomicUsize::new(9);
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const INTEGER: u64 = 10;
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const STRING: String = String::new();
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const SELF: Self = 11;
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const INPUT: u32 = 12;
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const ASSOC: Self::NonCopyType = 13;
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}
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struct Local<T, U>(T, U);
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impl<T: Trait2 + Trait<u32>, U: Trait2> Local<T, U> {
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const ASSOC_3: AtomicUsize = AtomicUsize::new(14); //~ ERROR interior mutable
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const COW: Cow<'static, str> = Cow::Borrowed("tuvwxy");
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const T_SELF: T = T::SELF_2;
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const U_SELF: U = U::SELF_2;
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//~^ ERROR interior mutable
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//~| HELP consider requiring `U` to be `Copy`
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const T_ASSOC: T::NonCopyType = T::ASSOC;
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//~^ ERROR interior mutable
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//~| HELP consider requiring `<T as Trait<u32>>::NonCopyType` to be `Copy`
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const U_ASSOC: U::CopyType = U::ASSOC_2;
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}
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fn main() {}
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