1 files changed, 76 insertions, 0 deletions
diff --git a/src/test/ui/dynamically-sized-types/dst-struct-sole.rs b/src/test/ui/dynamically-sized-types/dst-struct-sole.rs
new file mode 100644
index 000000000..6ca07fcf8
--- /dev/null
+++ b/src/test/ui/dynamically-sized-types/dst-struct-sole.rs
@@ -0,0 +1,76 @@
+// run-pass
+// As dst-struct.rs, but the unsized field is the only field in the struct.
+
+
+struct Fat<T: ?Sized> {
+    ptr: T
+}
+
+// x is a fat pointer
+fn foo(x: &Fat<[isize]>) {
+    let y = &x.ptr;
+    assert_eq!(x.ptr.len(), 3);
+    assert_eq!(y[0], 1);
+    assert_eq!(x.ptr[1], 2);
+}
+
+fn foo2<T:ToBar>(x: &Fat<[T]>) {
+    let y = &x.ptr;
+    let bar = Bar;
+    assert_eq!(x.ptr.len(), 3);
+    assert_eq!(y[0].to_bar(), bar);
+    assert_eq!(x.ptr[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 = Fat { ptr: [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]> = &Fat { ptr: [1, 2, 3] };
+    foo(f5);
+
+    // With a vec of Bars.
+    let bar = Bar;
+    let f1 = Fat { ptr: [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]> = &Fat { ptr: [bar, bar, bar] };
+    foo2(f5);
+
+    // Assignment.
+    let f5: &mut Fat<[isize]> = &mut Fat { ptr: [1, 2, 3] };
+    f5.ptr[1] = 34;
+    assert_eq!(f5.ptr[0], 1);
+    assert_eq!(f5.ptr[1], 34);
+    assert_eq!(f5.ptr[2], 3);
+
+    // Zero size vec.
+    let f5: &Fat<[isize]> = &Fat { ptr: [] };
+    assert!(f5.ptr.is_empty());
+    let f5: &Fat<[Bar]> = &Fat { ptr: [] };
+    assert!(f5.ptr.is_empty());
+}