From 4fbb71fda1a0e723a34e355037d3491bbb14dd2f Mon Sep 17 00:00:00 2001
From: Niko Matsakis <niko@alum.mit.edu>
Date: Sat, 16 Jan 2016 05:28:18 -0500
Subject: [PATCH] Add regression tests for #29859. However #29859 is not fully
 fixed.

---
 ...its-inductive-overflow-supertrait-oibit.rs | 28 +++++++++++++++++
 .../traits-inductive-overflow-supertrait.rs   | 25 +++++++++++++++
 .../traits-inductive-overflow-two-traits.rs   | 31 +++++++++++++++++++
 3 files changed, 84 insertions(+)
 create mode 100644 src/test/compile-fail/traits-inductive-overflow-supertrait-oibit.rs
 create mode 100644 src/test/compile-fail/traits-inductive-overflow-supertrait.rs
 create mode 100644 src/test/compile-fail/traits-inductive-overflow-two-traits.rs

diff --git a/src/test/compile-fail/traits-inductive-overflow-supertrait-oibit.rs b/src/test/compile-fail/traits-inductive-overflow-supertrait-oibit.rs
new file mode 100644
index 0000000000000..1362f8ac0aef5
--- /dev/null
+++ b/src/test/compile-fail/traits-inductive-overflow-supertrait-oibit.rs
@@ -0,0 +1,28 @@
+// Copyright 2015 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.
+
+// OIBIT-based version of #29859, supertrait version. Test that using
+// a simple OIBIT `..` impl alone still doesn't allow arbitary bounds
+// to be synthesized.
+
+#![feature(optin_builtin_traits)]
+
+trait Magic: Copy {}
+impl Magic for .. {}
+
+fn copy<T: Magic>(x: T) -> (T, T) { (x, x) }
+
+#[derive(Debug)]
+struct NoClone;
+
+fn main() {
+    let (a, b) = copy(NoClone); //~ ERROR E0277
+    println!("{:?} {:?}", a, b);
+}
diff --git a/src/test/compile-fail/traits-inductive-overflow-supertrait.rs b/src/test/compile-fail/traits-inductive-overflow-supertrait.rs
new file mode 100644
index 0000000000000..c717ae9639fa9
--- /dev/null
+++ b/src/test/compile-fail/traits-inductive-overflow-supertrait.rs
@@ -0,0 +1,25 @@
+// Copyright 2015 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.
+
+// Regression test for #29859, supertrait version. This example
+// allowed arbitrary trait bounds to be synthesized.
+
+trait Magic: Copy {}
+impl<T: Magic> Magic for T {}
+
+fn copy<T: Magic>(x: T) -> (T, T) { (x, x) }
+
+#[derive(Debug)]
+struct NoClone;
+
+fn main() {
+    let (a, b) = copy(NoClone); //~ ERROR E0275
+    println!("{:?} {:?}", a, b);
+}
diff --git a/src/test/compile-fail/traits-inductive-overflow-two-traits.rs b/src/test/compile-fail/traits-inductive-overflow-two-traits.rs
new file mode 100644
index 0000000000000..c622dca2b4df6
--- /dev/null
+++ b/src/test/compile-fail/traits-inductive-overflow-two-traits.rs
@@ -0,0 +1,31 @@
+// Copyright 2015 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.
+
+// Regression test for #29859, initial version. This example allowed
+// arbitrary trait bounds to be synthesized.
+
+// Trait that you want all types to implement.
+use std::marker::{Sync as Trait};
+
+pub trait Magic {
+    type X: Trait;
+}
+impl<T: Magic> Magic for T {
+    type X = Self;
+}
+
+fn check<T: Trait>() {}
+
+fn wizard<T: Magic>() { check::<<T as Magic>::X>(); }
+
+fn main() {
+    wizard::<*mut ()>(); //~ ERROR E0275
+    // check::<*mut ()>();
+}