#2242. Add LFCR line ending test

.gitattributes

@@ -1,3 +1,4 @@
 # Tests below shouldn't be part end-of-line conversion upon checkin or checkout
 Language/Reference/Lexical_Rules/line_endings_cr_t01.dart -text
 Language/Reference/Lexical_Rules/line_endings_crlf_t01.dart text eol=crlf
+Language/Reference/Lexical_Rules/line_endings_lfcr_t01.dart -text

Language/Reference/Lexical_Rules/line_endings_lfcr_t01.dart

@@ -0,0 +1,22 @@
+// Copyright (c) 2023, the Dart project authors.  Please see the AUTHORS file
+// for details. All rights reserved. Use of this source code is governed by a
+// BSD-style license that can be found in the LICENSE file.
+
+/// @assertion Dart source text is represented as a sequence of Unicode code
+/// points.
+///
+/// @description Checks that Dart program may use LFCR line endings
+/// @author sgrekhov22@gmail.com
+
+String hello() => "Hello";
+
+class World {
+  String world() {
+    return "World!";
+  }
+}
+
+main() {
+  print(hello() + " " + World().world());
+}
+