Fix a type annotation in the parser to make it accept non-literal strings as part URIs in checked m…

tests/language/library_juxtaposition_test.dart

Index: tests/language/library_juxtaposition_test.dart
diff --git a/tests/language/patch_test.dart b/tests/language/library_juxtaposition_test.dart
similarity index 76%
copy from tests/language/patch_test.dart
copy to tests/language/library_juxtaposition_test.dart
index cd2f17eff693747a9487975c3ded710c087c4550..ee1e7b4907fa4cce46ec74629b20e94ba1e66dcf 100644
--- a/tests/language/patch_test.dart
+++ b/tests/language/library_juxtaposition_test.dart
@@ -2,11 +2,8 @@
 // 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.
 
-patch() {
-  return 12;
-}
+import "library_" "juxtaposition_" "lib.dart";
 
 main() {
-  var x = patch();
-  Expect.equals(12, x);
+  Expect.equals(c, 47);
 }