From bc240ff606586bae4e1496ec3954c2f3a2b27c76 Mon Sep 17 00:00:00 2001
From: Ralf Jung <post@ralfj.de>
Date: Sat, 16 Sep 2017 12:11:48 +0200
Subject: [PATCH] add an undef validation test

---
 tests/compile-fail/validation_undef.rs | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
 create mode 100644 tests/compile-fail/validation_undef.rs

diff --git a/tests/compile-fail/validation_undef.rs b/tests/compile-fail/validation_undef.rs
new file mode 100644
index 0000000000000..b889b1ea5317b
--- /dev/null
+++ b/tests/compile-fail/validation_undef.rs
@@ -0,0 +1,14 @@
+#![allow(unused_variables)]
+// error-pattern: attempted to read undefined bytes
+
+mod safe {
+    use std::mem;
+
+    pub(crate) fn make_float() -> f32 {
+        unsafe { mem::uninitialized() }
+    }
+}
+
+fn main() {
+    let _x = safe::make_float();
+}