A test that I forgot to git-add

Author: marijnh

src/test/run-pass/nested-exhaustive-alt.rs

@@ -0,0 +1,6 @@
+fn main() {
+    alt @{foo: true, bar: some(10), baz: 20} {
+      @{foo: true, bar: some(_), _} {}
+      @{foo: false, bar: none, _} {}
+    }
+}