1 files changed, 31 insertions, 0 deletions
diff --git a/src/test/ui/extern/extern-types-pointer-cast.rs b/src/test/ui/extern/extern-types-pointer-cast.rs
new file mode 100644
index 000000000..de6955bfa
--- /dev/null
+++ b/src/test/ui/extern/extern-types-pointer-cast.rs
@@ -0,0 +1,31 @@
+// run-pass
+#![allow(dead_code)]
+// Test that pointers to extern types can be cast from/to usize,
+// despite being !Sized.
+#![feature(extern_types)]
+
+extern "C" {
+    type A;
+}
+
+struct Foo {
+    x: u8,
+    tail: A,
+}
+
+struct Bar<T: ?Sized> {
+    x: u8,
+    tail: T,
+}
+
+#[cfg(target_pointer_width = "32")]
+const MAGIC: usize = 0xdeadbeef;
+#[cfg(target_pointer_width = "64")]
+const MAGIC: usize = 0x12345678deadbeef;
+
+fn main() {
+    assert_eq!((MAGIC as *const A) as usize, MAGIC);
+    assert_eq!((MAGIC as *const Foo) as usize, MAGIC);
+    assert_eq!((MAGIC as *const Bar<A>) as usize, MAGIC);
+    assert_eq!((MAGIC as *const Bar<Bar<A>>) as usize, MAGIC);
+}