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Diffstat (limited to '')
-rw-r--r-- | src/test/ui/unsafe/unsafe-assign.rs | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/src/test/ui/unsafe/unsafe-assign.rs b/src/test/ui/unsafe/unsafe-assign.rs new file mode 100644 index 000000000..15273165b --- /dev/null +++ b/src/test/ui/unsafe/unsafe-assign.rs @@ -0,0 +1,25 @@ +// revisions: mirunsafeck thirunsafeck +// [thirunsafeck]compile-flags: -Z thir-unsafeck + +#![feature(rustc_attrs)] +#![allow(unused,dead_code)] + +fn nested_field() { + #[rustc_layout_scalar_valid_range_start(1)] + struct NonZero<T>(T); + + let mut foo = unsafe { NonZero((1,)) }; + foo.0.0 = 0; + //~^ ERROR: mutation of layout constrained field is unsafe +} + +fn block() { + #[rustc_layout_scalar_valid_range_start(1)] + struct NonZero<T>(T); + + let mut foo = unsafe { NonZero((1,)) }; + { foo.0 }.0 = 0; + // ^ not unsafe because the result of the block expression is a new place +} + +fn main() {} |