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dart/frog/tests/leg/src/ConstantFoldingTest.dart

Index: dart/frog/tests/leg/src/ConstantFoldingTest.dart
diff --git a/dart/frog/tests/leg/src/ConstantFoldingTest.dart b/dart/frog/tests/leg/src/ConstantFoldingTest.dart
index 6828d8eed77419e854ab78b4e4b7c4d11ba34b90..729d7f6cb65d75ec797f2893ea962a910268259c 100644
--- a/dart/frog/tests/leg/src/ConstantFoldingTest.dart
+++ b/dart/frog/tests/leg/src/ConstantFoldingTest.dart
@@ -42,17 +42,18 @@ void main() {
 
 void compileAndTest(String code, String entry, RegExp regexp) {
   String generated = compile(code, entry);
-  Expect.isTrue(regexp.hasMatch(generated));
+  Expect.isTrue(regexp.hasMatch(generated),
+                '"$generated" does not match /$regexp/');
 }
 
 main() {
   compileAndTest(
-      NUMBER_FOLDING, 'main', const RegExp(@"print\$1\(\(7\)\)"));
+      NUMBER_FOLDING, 'main', const RegExp(@"print\(\(7\)\)"));
   compileAndTest(
-      NEGATIVE_NUMBER_FOLDING, 'main', const RegExp(@"print\$1\(\(1\)\)"));
+      NEGATIVE_NUMBER_FOLDING, 'main', const RegExp(@"print\(\(1\)\)"));
 
   String generated = compile(NULL_EQUALS_FOLDING, 'foo');
-  RegExp regexp = const RegExp(@'eqNull\$1\(a\)');
+  RegExp regexp = const RegExp(@'eqNull\(a\)');
   Expect.isTrue(regexp.hasMatch(generated));
 
   regexp = const RegExp(@'\(?void 0\)? === b');