1 files changed, 79 insertions, 0 deletions
diff --git a/src/test/ui/dynamically-sized-types/dst-tuple-sole.rs b/src/test/ui/dynamically-sized-types/dst-tuple-sole.rs
new file mode 100644
index 000000000..606689da0
--- /dev/null
+++ b/src/test/ui/dynamically-sized-types/dst-tuple-sole.rs
@@ -0,0 +1,79 @@
+// run-pass
+#![allow(stable_features)]
+#![allow(type_alias_bounds)]
+
+// As dst-tuple.rs, but the unsized field is the only field in the tuple.
+
+
+#![feature(unsized_tuple_coercion)]
+
+type Fat<T: ?Sized> = (T,);
+
+// x is a fat pointer
+fn foo(x: &Fat<[isize]>) {
+    let y = &x.0;
+    assert_eq!(x.0.len(), 3);
+    assert_eq!(y[0], 1);
+    assert_eq!(x.0[1], 2);
+}
+
+fn foo2<T:ToBar>(x: &Fat<[T]>) {
+    let y = &x.0;
+    let bar = Bar;
+    assert_eq!(x.0.len(), 3);
+    assert_eq!(y[0].to_bar(), bar);
+    assert_eq!(x.0[1].to_bar(), bar);
+}
+
+#[derive(Copy, Clone, PartialEq, Eq, Debug)]
+struct Bar;
+
+trait ToBar {
+    fn to_bar(&self) -> Bar;
+}
+
+impl ToBar for Bar {
+    fn to_bar(&self) -> Bar {
+        *self
+    }
+}
+
+pub fn main() {
+    // With a vec of ints.
+    let f1 = ([1, 2, 3],);
+    foo(&f1);
+    let f2 = &f1;
+    foo(f2);
+    let f3: &Fat<[isize]> = f2;
+    foo(f3);
+    let f4: &Fat<[isize]> = &f1;
+    foo(f4);
+    let f5: &Fat<[isize]> = &([1, 2, 3],);
+    foo(f5);
+
+    // With a vec of Bars.
+    let bar = Bar;
+    let f1 = ([bar, bar, bar],);
+    foo2(&f1);
+    let f2 = &f1;
+    foo2(f2);
+    let f3: &Fat<[Bar]> = f2;
+    foo2(f3);
+    let f4: &Fat<[Bar]> = &f1;
+    foo2(f4);
+    let f5: &Fat<[Bar]> = &([bar, bar, bar],);
+    foo2(f5);
+
+    // Assignment.
+    let f5: &mut Fat<[isize]> = &mut ([1, 2, 3],);
+    f5.0[1] = 34;
+    assert_eq!(f5.0[0], 1);
+    assert_eq!(f5.0[1], 34);
+    assert_eq!(f5.0[2], 3);
+
+    // Zero size vec.
+    let f5: &Fat<[isize]> = &([],);
+    assert!(f5.0.is_empty());
+    let f5: &Fat<[Bar]> = &([],);
+    assert!(f5.0.is_empty());
+}