mirror of https://github.com/rust-lang/rust
31 lines
817 B
Rust
31 lines
817 B
Rust
//! Ensure we catch UB due to writing through a shared reference.
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#![feature(const_mut_refs, const_refs_to_cell)]
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#![deny(writes_through_immutable_pointer)]
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#![allow(invalid_reference_casting)]
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use std::mem;
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use std::cell::UnsafeCell;
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const WRITE_AFTER_CAST: () = unsafe {
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let mut x = 0;
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let ptr = &x as *const i32 as *mut i32;
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*ptr = 0; //~ERROR: writes_through_immutable_pointer
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//~^ previously accepted
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};
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const WRITE_AFTER_TRANSMUTE: () = unsafe {
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let mut x = 0;
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let ptr: *mut i32 = mem::transmute(&x);
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*ptr = 0; //~ERROR: writes_through_immutable_pointer
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//~^ previously accepted
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};
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// it's okay when there is interior mutability;
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const WRITE_INTERIOR_MUT: () = unsafe {
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let x = UnsafeCell::new(0);
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let ptr = &x as *const _ as *mut i32;
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*ptr = 0;
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};
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fn main() {}
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