Add script and tests for using keywords as identifiers

src/etc/generate-keyword-tests.py

@@ -0,0 +1,59 @@
+#!/usr/bin/env python
+# xfail-license
+# 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.
+"""
+This script takes a list of keywords and generates a testcase, that checks
+if using the keyword as identifier fails, for every keyword. The generate
+test files are set read-only.
+Test for https://github.com/mozilla/rust/issues/2275
+
+sample usage: src/etc/generate-keyword-tests.py as break
+"""
+
+import sys
+import os
+import datetime
+import stat
+
+
+template = """// Copyright %d 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.
+
+// This file was auto-generated using 'src/etc/generate-keyword-tests.py %s'
+
+fn main() {
+    let %s = "foo"; //~ error: ident
+}
+"""
+
+test_dir = os.path.abspath(
+    os.path.join(os.path.dirname(__file__), '../test/compile-fail')
+)
+
+for kw in sys.argv[1:]:
+    test_file = os.path.join(test_dir, 'keyword-%s-as-identifier.rs' % kw)
+
+    # set write permission if file exists, so it can be changed
+    if os.path.exists(test_file):
+        os.chmod(test_file, stat.S_IWUSR)
+
+    with open(test_file, 'wt') as f:
+        f.write(template % (datetime.datetime.now().year, kw, kw))
+
+    # mark file read-only
+    os.chmod(test_file, stat.S_IRUSR|stat.S_IRGRP|stat.S_IROTH)