From 5045e12bd7001956b14a6dfd642637a471e4b378 Mon Sep 17 00:00:00 2001
From: Aaron Hill <aa1ronham@gmail.com>
Date: Wed, 28 Nov 2018 21:15:06 -0500
Subject: Filter out self-referential projection predicates

If we end up with a projection predicate that equates a type with
itself (e.g. <T as MyType>::Value == <T as MyType>::Value), we can
run into issues if we try to add it to our ParamEnv.
---
 .../rustdoc/synthetic_auto/self-referential.rs     | 40 ++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 src/test/rustdoc/synthetic_auto/self-referential.rs

(limited to 'src/test/rustdoc')

diff --git a/src/test/rustdoc/synthetic_auto/self-referential.rs b/src/test/rustdoc/synthetic_auto/self-referential.rs
new file mode 100644
index 00000000000..077786b280f
--- /dev/null
+++ b/src/test/rustdoc/synthetic_auto/self-referential.rs
@@ -0,0 +1,40 @@
+// Copyright 2018 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.
+
+// Some unusual code minimized from
+// https://github.com/sile/handy_async/tree/7b619b762c06544fc67792c8ff8ebc24a88fdb98
+
+pub trait Pattern {
+    type Value;
+}
+
+pub struct Constrain<A, B = A, C = A>(A, B, C);
+
+impl<A, B, C> Pattern for Constrain<A, B, C>
+    where A: Pattern,
+          B: Pattern<Value = A::Value>,
+          C: Pattern<Value = A::Value>,
+{
+    type Value = A::Value;
+}
+
+pub struct Wrapper<T>(T);
+
+impl<T> Pattern for Wrapper<T> {
+    type Value = T;
+}
+
+
+// @has self_referential/struct.WriteAndThen.html
+// @has - '//*[@id="synthetic-implementations-list"]/*[@class="impl"]//*/code' "impl<P1> Send for \
+// WriteAndThen<P1>  where  <P1 as Pattern>::Value: Send"
+pub struct WriteAndThen<P1>(pub P1::Value, pub <Constrain<P1, Wrapper<P1::Value>> as Pattern>::Value)
+    where P1: Pattern;
+
-- 
cgit 1.4.1-3-g733a5