rustc_layout_scalar_valid_range makes ctors unsafe

1 files changed, 11 insertions, 0 deletions

diff --git a/tests/ui/unsafe/initializing-ranged-via-ctor.rs b/tests/ui/unsafe/initializing-ranged-via-ctor.rs
new file mode 100644
index 00000000000..ca44fa7e4e7
--- /dev/null
+++ b/tests/ui/unsafe/initializing-ranged-via-ctor.rs
@@ -0,0 +1,11 @@
+#![feature(rustc_attrs)]
+#![allow(internal_features)]
+
+#[derive(Debug)]
+#[rustc_layout_scalar_valid_range_start(2)]
+struct NonZeroAndOneU8(u8);
+
+fn main() {
+    println!("{:?}", Some(1).map(NonZeroAndOneU8).unwrap());
+    //~^ ERROR found `unsafe fn(u8) -> NonZeroAndOneU8 {NonZeroAndOneU8}`
+}