From d7544fe987104ad0a82b1929b819cfd7e2321bb2 Mon Sep 17 00:00:00 2001
From: Ben Blum <bblum@andrew.cmu.edu>
Date: Mon, 24 Jun 2013 20:02:24 -0400
Subject: [PATCH] Add two tests for the case of the recurring closure.

---
 .../the-case-of-the-recurring-closure-2.rs    | 44 +++++++++++++++++++
 .../the-case-of-the-recurring-closure.rs      | 44 +++++++++++++++++++
 2 files changed, 88 insertions(+)
 create mode 100644 src/test/compile-fail/the-case-of-the-recurring-closure-2.rs
 create mode 100644 src/test/compile-fail/the-case-of-the-recurring-closure.rs

diff --git a/src/test/compile-fail/the-case-of-the-recurring-closure-2.rs b/src/test/compile-fail/the-case-of-the-recurring-closure-2.rs
new file mode 100644
index 000000000000..bfb1e910495d
--- /dev/null
+++ b/src/test/compile-fail/the-case-of-the-recurring-closure-2.rs
@@ -0,0 +1,44 @@
+// Copyright 2013 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.
+
+// Tests correct kind-checking of the reason stack closures without the :Copy
+// bound must be noncopyable. For details see
+// http://smallcultfollowing.com/babysteps/blog/2013/04/30/the-case-of-the-recurring-closure/
+
+struct R<'self> {
+    // This struct is needed to create the
+    // otherwise infinite type of a fn that
+    // accepts itself as argument:
+    c: &'self fn:Copy(&R, bool)
+}
+
+fn innocent_looking_victim() {
+    let mut x = Some(~"hello");
+    do conspirator |f, writer| {
+        if writer {
+            x = None; //~ ERROR cannot implicitly borrow
+        } else {
+            match x {
+                Some(ref msg) => {
+                    (f.c)(f, true);
+                    println(fmt!("%?", msg));
+                },
+                None => fail!("oops"),
+            }
+        }
+    }
+}
+
+fn conspirator(f: &fn:Copy(&R, bool)) {
+    let r = R {c: f};
+    f(&r, false)
+}
+
+fn main() { innocent_looking_victim() }
diff --git a/src/test/compile-fail/the-case-of-the-recurring-closure.rs b/src/test/compile-fail/the-case-of-the-recurring-closure.rs
new file mode 100644
index 000000000000..f05c30c3355e
--- /dev/null
+++ b/src/test/compile-fail/the-case-of-the-recurring-closure.rs
@@ -0,0 +1,44 @@
+// Copyright 2013 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.
+
+// Tests correct kind-checking of the reason stack closures without the :Copy
+// bound must be noncopyable. For details see
+// http://smallcultfollowing.com/babysteps/blog/2013/04/30/the-case-of-the-recurring-closure/
+
+struct R<'self> {
+    // This struct is needed to create the
+    // otherwise infinite type of a fn that
+    // accepts itself as argument:
+    c: &'self fn(&R, bool)
+}
+
+fn innocent_looking_victim() {
+    let mut x = Some(~"hello");
+    do conspirator |f, writer| {
+        if writer {
+            x = None;
+        } else {
+            match x {
+                Some(ref msg) => {
+                    (f.c)(f, true);
+                    println(fmt!("%?", msg));
+                },
+                None => fail!("oops"),
+            }
+        }
+    }
+}
+
+fn conspirator(f: &fn(&R, bool)) {
+    let r = R {c: f};
+    f(&r, false) //~ ERROR use of moved value
+}
+
+fn main() { innocent_looking_victim() }