1 files changed, 9 insertions, 0 deletions
diff --git a/src/test/ui/transmute-equal-assoc-types.rs b/src/test/ui/transmute-equal-assoc-types.rs
new file mode 100644
index 000000000..6f357543e
--- /dev/null
+++ b/src/test/ui/transmute-equal-assoc-types.rs
@@ -0,0 +1,9 @@
+trait Foo {
+    type Bar;
+}
+
+unsafe fn noop<F: Foo>(foo: F::Bar) -> F::Bar {
+    ::std::mem::transmute(foo) //~ ERROR cannot transmute between types of different sizes
+}
+
+fn main() {}