1 files changed, 27 insertions, 0 deletions
diff --git a/tests/ui/packed-struct/packed-struct-generic-transmute.rs b/tests/ui/packed-struct/packed-struct-generic-transmute.rs
new file mode 100644
index 00000000000..c6264b6d2b3
--- /dev/null
+++ b/tests/ui/packed-struct/packed-struct-generic-transmute.rs
@@ -0,0 +1,27 @@
+// 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: cannot transmute between types of different sizes, or dependently-sized types
+
+use std::mem;
+
+#[repr(packed)]
+struct Foo<T,S> {
+    bar: T,
+    baz: S
+}
+
+struct Oof<T, S> {
+    rab: T,
+    zab: S
+}
+
+fn main() {
+    let foo = Foo { bar: [1u8, 2, 3, 4, 5], baz: 10i32 };
+    unsafe {
+        let oof: Oof<[u8; 5], i32> = mem::transmute(foo);
+        println!("{:?} {:?}", &oof.rab[..], oof.zab);
+    }
+}