1 files changed, 22 insertions, 0 deletions
diff --git a/tests/ui/unsafe/ranged_ints4_const.rs b/tests/ui/unsafe/ranged_ints4_const.rs
new file mode 100644
index 00000000000..a43c8be71c4
--- /dev/null
+++ b/tests/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
+}