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add mut_below_shr test

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This commit is contained in:
Ralf Jung 2022-04-20 10:47:22 -04:00
parent d4a85f6305
commit e214e6db98
1 changed files with 10 additions and 0 deletions
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10
tests/run-pass/stacked-borrows/stacked-borrows.rs
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@ -16,6 +16,7 @@ fn main() {
disjoint_mutable_subborrows(); disjoint_mutable_subborrows();
raw_ref_to_part(); raw_ref_to_part();
array_casts(); array_casts();
mut_below_shr();
} }
// Make sure that reading from an `&mut` does, like reborrowing to `&`, // Make sure that reading from an `&mut` does, like reborrowing to `&`,
@ -186,3 +187,12 @@ fn array_casts() {
let p = &x as *const usize; let p = &x as *const usize;
assert_eq!(unsafe { *p.add(1) }, 1); assert_eq!(unsafe { *p.add(1) }, 1);
} }
/// Transmuting &&i32 to &&mut i32 is fine.
fn mut_below_shr() {
let x = 0;
let y = &x;
let p = unsafe { core::mem::transmute::<&&i32,&&mut i32>(&y) };
let r = &**p;
let _val = *r;
}