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add FIXME test for coercing &mut to *const #565

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merged 1 commit into from
Dec 7, 2018
Merged

add FIXME test for coercing &mut to *const #565

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11 changes: 11 additions & 0 deletions tests/run-pass/stacked-borrows.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@ fn main() {
mut_raw_mut();
partially_invalidate_mut();
drop_after_sharing();
direct_mut_to_const_raw();
}

// Deref a raw ptr to access a field of a large struct, where the field
Expand Down Expand Up @@ -112,3 +113,13 @@ fn drop_after_sharing() {
let x = String::from("hello!");
let _len = x.len();
}

// Make sure that coercing &mut T to *const T produces a writeable pointer.
fn direct_mut_to_const_raw() {
// FIXME: This is currently disabled, waiting on a fix for <https://github.com/rust-lang/rust/issues/56604>
/*let x = &mut 0;
let y: *const i32 = x;
unsafe { *(y as *mut i32) = 1; }
assert_eq!(*x, 1);
*/
}