diff options
Diffstat (limited to 'src/test/ui/unsafe/ranged_ints4_const.rs')
-rw-r--r-- | src/test/ui/unsafe/ranged_ints4_const.rs | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/test/ui/unsafe/ranged_ints4_const.rs b/src/test/ui/unsafe/ranged_ints4_const.rs new file mode 100644 index 000000000..a43c8be71 --- /dev/null +++ b/src/test/ui/unsafe/ranged_ints4_const.rs @@ -0,0 +1,22 @@ +// revisions: mirunsafeck thirunsafeck +// [thirunsafeck]compile-flags: -Z thir-unsafeck + +#![feature(rustc_attrs)] + +#[rustc_layout_scalar_valid_range_start(1)] +#[repr(transparent)] +pub(crate) struct NonZero<T>(pub(crate) T); +fn main() {} + +const fn foo() -> NonZero<u32> { + let mut x = unsafe { NonZero(1) }; + x.0 = 0; + //~^ ERROR mutation of layout constrained field is unsafe + x +} + +const fn bar() -> NonZero<u32> { + let mut x = unsafe { NonZero(1) }; + unsafe { x.0 = 0 }; // this is UB + x +} |