1 files changed, 30 insertions, 0 deletions
diff --git a/src/test/ui/compile-fail-migration/mutable-class-fields.rs b/src/test/ui/compile-fail-migration/mutable-class-fields.rs
new file mode 100644
index 00000000000..f138ae93f71
--- /dev/null
+++ b/src/test/ui/compile-fail-migration/mutable-class-fields.rs
@@ -0,0 +1,30 @@
+// Copyright 2012 The Rust Project Developers. See the COPYRIGHT
+// file at the top-level directory of this distribution and at
+// http://rust-lang.org/COPYRIGHT.
+//
+// Licensed under the Apache License, Version 2.0 <LICENSE-APACHE or
+// http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
+// <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your
+// option. This file may not be copied, modified, or distributed
+// except according to those terms.
+
+// revisions: ast mir
+//[mir]compile-flags: -Z borrowck=mir
+
+struct cat {
+  meows : usize,
+  how_hungry : isize,
+}
+
+fn cat(in_x : usize, in_y : isize) -> cat {
+    cat {
+        meows: in_x,
+        how_hungry: in_y
+    }
+}
+
+fn main() {
+  let nyan : cat = cat(52, 99);
+  nyan.how_hungry = 0; //[ast]~ ERROR cannot assign
+  //[mir]~^ ERROR cannot assign
+}