Fix warnings_checker.dart handling of multitests

tests/language/bit_operations_test.dart

 // Copyright (c) 2011, 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.
 // Dart test for testing bitwise operations.
 // VMOptions=--optimization-counter-threshold=10 --no-use-osr --no-background-compilation
 
 import "package:expect/expect.dart";
 
 void main() {
   for (int i = 0; i < 4; i++) {
@@ skipping 75 matching lines @@
 void testRightShift64Bit() {
   var t = 0x1ffffffff;
   Expect.equals(0xffffffff, t >> 1);
 }
 
 void testLeftShift64Bit() {
   var t = 0xffffffff;
   Expect.equals(0xffffffff, t << 0);
   Expect.equals(0x1fffffffe, t << 1);
   Expect.equals(0x7fffffff80000000, t << 31);
-  Expect.equals(0x10000000000000000, 2*(t+1) << 31); /// 01: static type warning
-  Expect.equals(0x20000000000000000, 4*(t+1) << 31); /// 02: static type warning
+  Expect.equals(0x10000000000000000, 2*(t+1) << 31); //# 01: static type warning
+  Expect.equals(0x20000000000000000, 4*(t+1) << 31); //# 02: static type warning
   Expect.equals(0x8000000000000000, (t+1) << 31);
 }
 
 void testLeftShift64BitWithOverflow1() {
   var t = 0xffffffff;
-  Expect.equals(0x10000000000000000, 2*(t+1) << 31); /// 03: static type warning
+  Expect.equals(0x10000000000000000, 2*(t+1) << 31); //# 03: static type warning
 }
 
 void testLeftShift64BitWithOverflow2() {
   var t = 0xffffffff;
-  Expect.equals(0x20000000000000000, 4*(t+1) << 31); /// 04: static type warning
+  Expect.equals(0x20000000000000000, 4*(t+1) << 31); //# 04: static type warning
 }
 
 void testLeftShift64BitWithOverflow3() {
   var t = 0xffffffff;
   Expect.equals(0x8000000000000000, (t+1) << 31);
 }
 
 void testNegativeCountShifts() {
   bool throwOnLeft(a, b) {
     try {
@@ skipping 67 matching lines @@
   Expect.notEquals((a & b) ^ (c | (d & b)) ^ c, result); //    &|^
   Expect.notEquals((a & b) ^ ((c | d) & b) ^ c, result); //    |&^
   Expect.notEquals(a & (b ^ (c | d)) & (b ^ c), result); //    |^&
   Expect.notEquals(a & ((b ^ c) | d) & (b ^ c), result); //    ^|&
   // Binds stronger than relational operators.
   Expect.equals((a & b) < (c & d), a & b < c & d);
   // Binds weaker than shift operators.
   Expect.equals((a & (b << c)) ^ d, a & b << c ^ d);
   Expect.notEquals((a & b) << (c ^ d), a & b << c ^ d);
 }