diff --git a/src/librustc/middle/typeck/check/mod.rs b/src/librustc/middle/typeck/check/mod.rs
index 68f4fd95626..820c5bd859c 100644
--- a/src/librustc/middle/typeck/check/mod.rs
+++ b/src/librustc/middle/typeck/check/mod.rs
@@ -2767,7 +2767,8 @@ fn check_expr_with_unifier(fcx: &FnCtxt,
           if !checked {
               tcx.sess.span_err(expr.span,
                                 "only the managed heap and exchange heap are \
-                                 currently supported")
+                                 currently supported");
+              fcx.write_ty(id, ty::mk_err());
           }
       }
 
diff --git a/src/test/compile-fail/issue-14084.rs b/src/test/compile-fail/issue-14084.rs
new file mode 100644
index 00000000000..d247bf0913c
--- /dev/null
+++ b/src/test/compile-fail/issue-14084.rs
@@ -0,0 +1,14 @@
+// Copyright 2014 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.
+
+fn main() {
+    box ( () ) 0;
+    //~^ ERROR: only the managed heap and exchange heap are currently supported
+}