opt out the listener.dart generated file (#69223)

506d0f09 · Jacob MacDonald · GitHub · 3b9ef2e8 · 506d0f09
Unverified Commit 506d0f09 authored Oct 28, 2020 by Jacob MacDonald Committed by GitHub Oct 28, 2020
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flutter_web_platform.dart ...ages/flutter_tools/lib/src/test/flutter_web_platform.dart +1 -0

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--- a/packages/flutter_tools/lib/src/test/flutter_web_platform.dart
+++ b/packages/flutter_tools/lib/src/test/flutter_web_platform.dart
@@ -945,6 +945,7 @@ class TestGoldenComparatorProcess {
    final File testConfigFile = findTestConfigFile(globals.fs.file(testUri));
    // Generate comparator process for the file.
    return '''
+// @dart=2.9
 import 'dart:convert'; // ignore: dart_convert_import
 import 'dart:io'; // ignore: dart_io_import