From a2fab457dcb6e65e119694acacc8d92fde2569c2 Mon Sep 17 00:00:00 2001
From: Eduard Bopp <eduard.bopp@aepsil0n.de>
Date: Tue, 11 Feb 2014 00:19:27 +0100
Subject: [PATCH] Reserve `do` as a keyword

Resolves issue #12157. `do` is hereby reinstated as a keyword; no syntax is
associated with it though. Along the way, a unit test had to be adapted, since
it was using `do` as a method identifier.

Breaking changes:

- Any code using `do` as an identifier will no longer work.
---
 src/libsyntax/parse/token.rs                        |  1 +
 src/test/compile-fail/keyword-do-as-identifier.rs   | 13 +++++++++++++
 .../run-pass/temporary-lifetime-for-conditions.rs   |  6 +++---
 3 files changed, 17 insertions(+), 3 deletions(-)
 create mode 100644 src/test/compile-fail/keyword-do-as-identifier.rs

diff --git a/src/libsyntax/parse/token.rs b/src/libsyntax/parse/token.rs
index d32411b4f050a..1e9eab1573bdd 100644
--- a/src/libsyntax/parse/token.rs
+++ b/src/libsyntax/parse/token.rs
@@ -492,6 +492,7 @@ declare_special_idents_and_keywords! {
         (53,                         Typeof,     "typeof");
         (54,                         Unsized,    "unsized");
         (55,                         Yield,      "yield");
+        (56,                         Do,         "do");
     }
 }
 
diff --git a/src/test/compile-fail/keyword-do-as-identifier.rs b/src/test/compile-fail/keyword-do-as-identifier.rs
new file mode 100644
index 0000000000000..90f73f8a9f422
--- /dev/null
+++ b/src/test/compile-fail/keyword-do-as-identifier.rs
@@ -0,0 +1,13 @@
+// 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.
+
+fn main() {
+    let do = "bar"; //~ error: ident
+}
diff --git a/src/test/run-pass/temporary-lifetime-for-conditions.rs b/src/test/run-pass/temporary-lifetime-for-conditions.rs
index 1985970b1071c..0716ea5cdeb4a 100644
--- a/src/test/run-pass/temporary-lifetime-for-conditions.rs
+++ b/src/test/run-pass/temporary-lifetime-for-conditions.rs
@@ -23,7 +23,7 @@ impl Drop for Temporary {
 }
 
 impl Temporary {
-    fn do(&self) -> bool {true}
+    fn do_stuff(&self) -> bool {true}
 }
 
 fn borrow() -> ~Temporary { ~Temporary }
@@ -35,7 +35,7 @@ pub fn main() {
     // This loop's condition
     // should call `Temporary`'s
     // `drop` 6 times.
-    while borrow().do() {
+    while borrow().do_stuff() {
         i += 1;
         if i > 5 {
             break;
@@ -44,7 +44,7 @@ pub fn main() {
 
     // This if condition should
     // call it 1 time
-    if borrow().do() {
+    if borrow().do_stuff() {
         unsafe { assert_eq!(DROPPED, 7) }
     }
 }