Update all tests

tests/language_strong/prefix_identifier_reference_test.dart

Index: tests/language_strong/prefix_identifier_reference_test.dart
diff --git a/tests/language_strong/prefix_identifier_reference_test.dart b/tests/language_strong/prefix_identifier_reference_test.dart
index a45d3bdf28c50426ed19558ce1561f208d2fc0c5..36ef6bb3e2c2273abe64f4d1e567537144c78128 100644
--- a/tests/language_strong/prefix_identifier_reference_test.dart
+++ b/tests/language_strong/prefix_identifier_reference_test.dart
@@ -17,9 +17,9 @@ import "empty_library.dart" as p;
 void f(x) {}
 
 main() {
-  f(p);         /// 01: compile-time error
-  var x = p;    /// 02: compile-time error
-  var x = p[0]; /// 03: compile-time error
-  p[0] = null;  /// 04: compile-time error
-  p += 0;       /// 05: compile-time error
+  f(p);         //# 01: compile-time error
+  var x = p;    //# 02: compile-time error
+  var x = p[0]; //# 03: compile-time error
+  p[0] = null;  //# 04: compile-time error
+  p += 0;       //# 05: compile-time error
 }