1 files changed, 30 insertions, 0 deletions
diff --git a/src/test/ui/dynamically-sized-types/dst-deref.rs b/src/test/ui/dynamically-sized-types/dst-deref.rs
new file mode 100644
index 000000000..0a350bac1
--- /dev/null
+++ b/src/test/ui/dynamically-sized-types/dst-deref.rs
@@ -0,0 +1,30 @@
+// run-pass
+// Test that a custom deref with a fat pointer return type does not ICE
+
+
+use std::ops::Deref;
+
+pub struct Arr {
+    ptr: Box<[usize]>
+}
+
+impl Deref for Arr {
+    type Target = [usize];
+
+    fn deref(&self) -> &[usize] {
+        &*self.ptr
+    }
+}
+
+pub fn foo(arr: &Arr) {
+    assert_eq!(arr.len(), 3);
+    let x: &[usize] = &**arr;
+    assert_eq!(x[0], 1);
+    assert_eq!(x[1], 2);
+    assert_eq!(x[2], 3);
+}
+
+fn main() {
+    let a = Arr { ptr: Box::new([1, 2, 3]) };
+    foo(&a);
+}