Add an xfailed test case and a CONTRIBUTING.md file

1 files changed, 34 insertions, 0 deletions

diff --git a/src/test/run-pass/recursion.rs b/src/test/run-pass/recursion.rs
new file mode 100644
index 00000000000..8cc2c8cc80a
--- /dev/null
+++ b/src/test/run-pass/recursion.rs
@@ -0,0 +1,34 @@
+// 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.
+
+// xfail-test
+enum Nil {Nil}
+struct Cons<T> {head:int, tail:T}
+trait Dot {fn dot(other:self) -> int;}
+impl Nil:Dot {
+  fn dot(_:Nil) -> int {0}
+}
+impl<T:Dot> Cons<T>:Dot {
+  fn dot(other:Cons<T>) -> int {
+    self.head * other.head + self.tail.dot(other.tail)
+  }
+}
+fn test<T:Dot> (n:int, i:int, first:T, second:T) ->int {
+  match n {
+    0 => {first.dot(second)}
+      // Error message should be here. It should be a type error
+      // to instantiate `test` at a type other than T. (See #4287)
+    _ => {test (n-1, i+1, Cons {head:2*i+1, tail:first}, Cons{head:i*i, tail:second})}
+  }
+}
+fn main() {
+  let n = test(1, 0, Nil, Nil);
+  io::println(fmt!("%d", n));
+}