1 files changed, 46 insertions, 0 deletions
diff --git a/tests/ui/borrowck/borrowck-anon-fields-variant.rs b/tests/ui/borrowck/borrowck-anon-fields-variant.rs
new file mode 100644
index 00000000000..6e63de9136c
--- /dev/null
+++ b/tests/ui/borrowck/borrowck-anon-fields-variant.rs
@@ -0,0 +1,46 @@
+enum Foo {
+    X, Y(usize, usize)
+}
+
+fn distinct_variant() {
+    let mut y = Foo::Y(1, 2);
+
+    let a = match y {
+      Foo::Y(ref mut a, _) => a,
+      Foo::X => panic!()
+    };
+
+    // While `a` and `b` are disjoint, borrowck doesn't know that `a` is not
+    // also used for the discriminant of `Foo`, which it would be if `a` was a
+    // reference.
+    let b = match y {
+      //~^ ERROR cannot use `y`
+      Foo::Y(_, ref mut b) => b,
+      Foo::X => panic!()
+    };
+
+    *a += 1;
+    *b += 1;
+}
+
+fn same_variant() {
+    let mut y = Foo::Y(1, 2);
+
+    let a = match y {
+      Foo::Y(ref mut a, _) => a,
+      Foo::X => panic!()
+    };
+
+    let b = match y {
+      //~^ ERROR cannot use `y`
+      Foo::Y(ref mut b, _) => b,
+      //~^ ERROR cannot borrow `y.0` as mutable
+      Foo::X => panic!()
+    };
+
+    *a += 1;
+    *b += 1;
+}
+
+fn main() {
+}