1 files changed, 29 insertions, 0 deletions
diff --git a/src/test/ui/packed-struct/packed-struct-transmute.rs b/src/test/ui/packed-struct/packed-struct-transmute.rs
new file mode 100644
index 000000000..a7d284025
--- /dev/null
+++ b/src/test/ui/packed-struct/packed-struct-transmute.rs
@@ -0,0 +1,29 @@
+// 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
+
+// normalize-stderr-test "\d+ bits" -> "N bits"
+// error-pattern: cannot transmute between types of different sizes, or dependently-sized types
+
+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);
+    }
+}