1 files changed, 38 insertions, 0 deletions
diff --git a/src/test/ui/compile-fail-migration/packed-struct-transmute.rs b/src/test/ui/compile-fail-migration/packed-struct-transmute.rs
new file mode 100644
index 00000000000..abb02dd39e6
--- /dev/null
+++ b/src/test/ui/compile-fail-migration/packed-struct-transmute.rs
@@ -0,0 +1,38 @@
+// Copyright 2013 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// This assumes the packed and non-packed structs are different sizes.
+
+// the error points to the start of the file, not the line with the
+// transmute
+
+// error-pattern: transmute called with types of different sizes
+
+use std::mem;
+
+#[repr(packed)]
+struct Foo {
+    bar: u8,
+    baz: usize
+}
+
+#[derive(Debug)]
+struct Oof {
+    rab: u8,
+    zab: usize
+}
+
+fn main() {
+    let foo = Foo { bar: 1, baz: 10 };
+    unsafe {
+        let oof: Oof = mem::transmute(foo);
+        println!("{:?}", oof);
+    }
+}