From 258ec30116b1a80f4a9fb4b14aa22dd88eb8bf31 Mon Sep 17 00:00:00 2001
From: Wonwoo Choi <chwo9843@gmail.com>
Date: Tue, 5 Sep 2017 18:25:42 +0900
Subject: [PATCH] Expect pipe symbol after closure parameter lists

---
 src/libsyntax/parse/parser.rs        |  2 +-
 src/test/compile-fail/issue-44021.rs | 16 ++++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)
 create mode 100644 src/test/compile-fail/issue-44021.rs

diff --git a/src/libsyntax/parse/parser.rs b/src/libsyntax/parse/parser.rs
index 1f033b25fe4f6..a52d048830715 100644
--- a/src/libsyntax/parse/parser.rs
+++ b/src/libsyntax/parse/parser.rs
@@ -4699,7 +4699,7 @@ impl<'a> Parser<'a> {
                     SeqSep::trailing_allowed(token::Comma),
                     |p| p.parse_fn_block_arg()
                 );
-                self.bump();
+                self.expect(&token::BinOp(token::Or))?;
                 args
             }
         };
diff --git a/src/test/compile-fail/issue-44021.rs b/src/test/compile-fail/issue-44021.rs
new file mode 100644
index 0000000000000..b6ec21b94c73f
--- /dev/null
+++ b/src/test/compile-fail/issue-44021.rs
@@ -0,0 +1,16 @@
+// 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.
+
+struct MyStruct;
+impl MyStruct {
+    fn f() {|x, y} //~ ERROR expected one of `:`, `@`, or `|`, found `}`
+}
+
+fn main() {}