StackTrace parser, fix assertion error message (#48343)

packages/flutter/lib/foundation.dart

@@ -52,5 +52,6 @@ export 'src/foundation/platform.dart';
 export 'src/foundation/print.dart';
 export 'src/foundation/profile.dart';
 export 'src/foundation/serialization.dart';
+export 'src/foundation/stack_frame.dart';
 export 'src/foundation/synchronous_future.dart';
 export 'src/foundation/unicode.dart';

packages/flutter/lib/src/foundation/assertions.dart

@@ -8,6 +8,7 @@ import 'basic_types.dart';
 import 'constants.dart';
 import 'diagnostics.dart';
 import 'print.dart';
+import 'stack_frame.dart';
 
 /// Signature for [FlutterError.onError] handler.
 typedef FlutterExceptionHandler = void Function(FlutterErrorDetails details);
@@ -418,39 +419,31 @@ class FlutterErrorDetails extends Diagnosticable {
       }
     }
 
-    final Iterable<String> stackLines = (stack != null) ? stack.toString().trimRight().split('\n') : null;
-    if (exception is AssertionError && diagnosticable == null) {
-      bool ourFault = true;
-      if (stackLines != null) {
-        final List<String> stackList = stackLines.take(2).toList();
-        if (stackList.length >= 2) {
-          // TODO(ianh): This has bitrotted and is no longer matching. https://github.com/flutter/flutter/issues/4021
-          final RegExp throwPattern = RegExp(
-              r'^#0 +_AssertionError._throwNew \(dart:.+\)$');
-          final RegExp assertPattern = RegExp(
-              r'^#1 +[^(]+ \((.+?):([0-9]+)(?::[0-9]+)?\)$');
-          if (throwPattern.hasMatch(stackList[0])) {
-            final Match assertMatch = assertPattern.firstMatch(stackList[1]);
-            if (assertMatch != null) {
-              assert(assertMatch.groupCount == 2);
-              final RegExp ourLibraryPattern = RegExp(r'^package:flutter/');
-              ourFault = ourLibraryPattern.hasMatch(assertMatch.group(1));
-            }
-          }
+    if (stack != null) {
+      if (exception is AssertionError && diagnosticable == null) {
+        // After popping off any dart: stack frames, are there at least two more
+        // stack frames coming from package flutter?
+        //
+        // If not: Error is in user code (user violated assertion in framework).
+        // If so:  Error is in Framework. We either need an assertion higher up
+        //         in the stack, or we've violated our own assertions.
+        final List<StackFrame> stackFrames = StackFrame.fromStackTrace(stack)
+                                                       .skipWhile((StackFrame frame) => frame.packageScheme == 'dart')
+                                                       .toList();
+        final bool ourFault =  stackFrames.length >= 2
+                            && stackFrames[0].package == 'flutter'
+                            && stackFrames[1].package == 'flutter';
+        if (ourFault) {
+          properties.add(ErrorSpacer());
+          properties.add(ErrorHint(
+            'Either the assertion indicates an error in the framework itself, or we should '
+            'provide substantially more information in this error message to help you determine '
+            'and fix the underlying cause.\n'
+            'In either case, please report this assertion by filing a bug on GitHub:\n'
+            '  https://github.com/flutter/flutter/issues/new?template=BUG.md'
+          ));
         }
       }
-      if (ourFault) {
-        properties.add(ErrorSpacer());
-        properties.add(ErrorHint(
-          'Either the assertion indicates an error in the framework itself, or we should '
-          'provide substantially more information in this error message to help you determine '
-          'and fix the underlying cause.\n'
-          'In either case, please report this assertion by filing a bug on GitHub:\n'
-          '  https://github.com/flutter/flutter/issues/new?template=BUG.md'
-        ));
-      }
-    }
-    if (stack != null) {
       properties.add(ErrorSpacer());
       properties.add(DiagnosticsStackTrace('When the exception was thrown, this was the stack', stack, stackFilter: stackFilter));
     }
@@ -672,39 +665,27 @@ class FlutterError extends Error with DiagnosticableTreeMixin implements Asserti
   /// format but the frame numbers will not be consecutive (frames are elided)
   /// and the final line may be prose rather than a stack frame.
   static Iterable<String> defaultStackFilter(Iterable<String> frames) {
-    const List<String> filteredPackages = <String>[
+    const Set<String> filteredPackages = <String>{
       'dart:async-patch',
       'dart:async',
       'package:stack_trace',
-    ];
-    const List<String> filteredClasses = <String>[
+    };
+    const Set<String> filteredClasses = <String>{
       '_AssertionError',
       '_FakeAsync',
       '_FrameCallbackEntry',
-    ];
-    final RegExp stackParser = RegExp(r'^#[0-9]+ +([^.]+).* \(([^/\\]*)[/\\].+:[0-9]+(?::[0-9]+)?\)$');
-    final RegExp packageParser = RegExp(r'^([^:]+):(.+)$');
+    };
     final List<String> result = <String>[];
     final List<String> skipped = <String>[];
     for (final String line in frames) {
-      final Match match = stackParser.firstMatch(line);
-      if (match != null) {
-        assert(match.groupCount == 2);
-        if (filteredPackages.contains(match.group(2))) {
-          final Match packageMatch = packageParser.firstMatch(match.group(2));
-          if (packageMatch != null && packageMatch.group(1) == 'package') {
-            skipped.add('package ${packageMatch.group(2)}'); // avoid "package package:foo"
-          } else {
-            skipped.add('package ${match.group(2)}');
-          }
-          continue;
-        }
-        if (filteredClasses.contains(match.group(1))) {
-          skipped.add('class ${match.group(1)}');
-          continue;
-        }
+      final StackFrame frameLine = StackFrame.fromStackTraceLine(line);
+      if (filteredClasses.contains(frameLine.className)) {
+        skipped.add('class ${frameLine.className}');
+      } else if (filteredPackages.contains(frameLine.packageScheme + ':' + frameLine.package)) {
+        skipped.add('package ${frameLine.packageScheme == 'dart' ? 'dart:' : ''}${frameLine.package}');
+      } else {
+        result.add(line);
       }
-      result.add(line);
     }
     if (skipped.length == 1) {
       result.add('(elided one frame from ${skipped.single})');
@@ -794,9 +775,11 @@ class DiagnosticsStackTrace extends DiagnosticsBlock {
   }) : super(
     name: name,
     value: stack,
-    properties: (stackFilter ?? FlutterError.defaultStackFilter)(stack.toString().trimRight().split('\n'))
-      .map<DiagnosticsNode>(_createStackFrame)
-      .toList(),
+    properties: stack == null
+        ? <DiagnosticsNode>[]
+        : (stackFilter ?? FlutterError.defaultStackFilter)(stack.toString().trimRight().split('\n'))
+              .map<DiagnosticsNode>(_createStackFrame)
+              .toList(),
     style: DiagnosticsTreeStyle.flat,
     showSeparator: showSeparator,
     allowTruncate: true,

packages/flutter/lib/src/foundation/diagnostics.dart

@@ -1630,6 +1630,7 @@ abstract class DiagnosticsNode {
       return toStringDeep(parentConfiguration: parentConfiguration, minLevel: minLevel);
 
     final String description = toDescription(parentConfiguration: parentConfiguration);
+    assert(description != null);
 
     if (name == null || name.isEmpty || !showName)
       return description;

packages/flutter/lib/src/foundation/stack_frame.dart

+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'dart:ui' show hashValues;
+
+import 'package:meta/meta.dart';
+
+/// A object representation of a frame from a stack trace.
+///
+/// {@tool sample}
+///
+/// This example creates a traversable list of parsed [StackFrame] objects from
+/// the current [StackTrace].
+///
+/// ```dart
+/// final List<StackFrame> currentFrames = StackFrame.fromStackTrace(StackTrace.current);
+/// ```
+/// {@end-tool}
+@immutable
+class StackFrame {
+  /// Creates a new StackFrame instance.
+  ///
+  /// All parameters must not be null. The [className] may be the empty string
+  /// if there is no class (e.g. for a top level library method).
+  const StackFrame({
+    @required this.number,
+    @required this.column,
+    @required this.line,
+    @required this.packageScheme,
+    @required this.package,
+    @required this.packagePath,
+    this.className = '',
+    @required this.method,
+    this.isConstructor = false,
+    @required this.source,
+  })  : assert(number != null),
+        assert(column != null),
+        assert(line != null),
+        assert(method != null),
+        assert(packageScheme != null),
+        assert(package != null),
+        assert(packagePath != null),
+        assert(className != null),
+        assert(isConstructor != null),
+        assert(source != null);
+
+  /// A stack frame representing an asynchronous suspension.
+  static const StackFrame asynchronousSuspension = StackFrame(
+    number: -1,
+    column: -1,
+    line: -1,
+    method: 'asynchronous suspension',
+    packageScheme: '',
+    package: '',
+    packagePath: '',
+    source: '<asynchronous suspension>',
+  );
+
+  /// Parses a list of [StackFrame]s from a [StackTrace] object.
+  ///
+  /// This is normally useful with [StackTrace.current].
+  static List<StackFrame> fromStackTrace(StackTrace stack) {
+    assert(stack != null);
+    return fromStackString(stack.toString());
+  }
+
+  /// Parses a list of [StackFrame]s from the [StackTrace.toString] method.
+  static List<StackFrame> fromStackString(String stack) {
+    assert(stack != null);
+    return stack
+        .trim()
+        .split('\n')
+        .map(fromStackTraceLine)
+        .toList();
+  }
+
+  static StackFrame _parseWebFrame(String line) {
+    final bool hasPackage = line.startsWith('package');
+    final RegExp parser = hasPackage
+        ? RegExp(r'^(package:.+) (\d+):(\d+)\s+(.+)$')
+        : RegExp(r'^(.+) (\d+):(\d+)\s+(.+)$');
+    final Match match = parser.firstMatch(line);
+    assert(match != null, 'Expecgted $line to match $parser.');
+
+    String package = '<unknown>';
+    String packageScheme = '<unknown>';
+    String packagePath = '<unknown>';
+    if (hasPackage) {
+      packageScheme = 'package';
+      final Uri packageUri = Uri.parse(match.group(1));
+      package = packageUri.pathSegments[0];
+      packagePath = packageUri.path.replaceFirst(packageUri.pathSegments[0] + '/', '');
+    }
+
+    return StackFrame(
+      number: -1,
+      packageScheme: packageScheme,
+      package: package,
+      packagePath: packagePath,
+      line: int.parse(match.group(2)),
+      column: int.parse(match.group(3)),
+      className: '<unknown>',
+      method: match.group(4),
+      source: line,
+    );
+  }
+
+  /// Parses a single [StackFrame] from a single line of a [StackTrace].
+  static StackFrame fromStackTraceLine(String line) {
+    assert(line != null);
+    if (line == '<asynchronous suspension>') {
+      return asynchronousSuspension;
+    }
+
+    // Web frames.
+    if (!line.startsWith('#')) {
+      return _parseWebFrame(line);
+    }
+
+    final RegExp parser = RegExp(r'^#(\d+) +(.+) \((.+?):?(\d+){0,1}:?(\d+){0,1}\)$');
+    final Match match = parser.firstMatch(line);
+    assert(match != null, 'Expected $line to match $parser.');
+
+    bool isConstructor = false;
+    String className = '';
+    String method = match.group(2).replaceAll('.<anonymous closure>', '');
+    if (method.startsWith('new')) {
+      className = method.split(' ')[1];
+      method = '';
+      if (className.contains('.')) {
+        final List<String> parts  = className.split('.');
+        className = parts[0];
+        method = parts[1];
+      }
+      isConstructor = true;
+    } else if (method.contains('.')) {
+      final List<String> parts = method.split('.');
+      className = parts[0];
+      method = parts[1];
+    }
+
+    final Uri packageUri = Uri.parse(match.group(3));
+    String package = '<unknown>';
+    String packagePath = packageUri.path;
+    if (packageUri.scheme == 'dart' || packageUri.scheme == 'package') {
+      package = packageUri.pathSegments[0];
+      packagePath = packageUri.path.replaceFirst(packageUri.pathSegments[0] + '/', '');
+    }
+
+    return StackFrame(
+      number: int.parse(match.group(1)),
+      className: className,
+      method: method,
+      packageScheme: packageUri.scheme,
+      package: package,
+      packagePath: packagePath,
+      line: match.group(4) == null ? -1 : int.parse(match.group(4)),
+      column: match.group(5) == null ? -1 : int.parse(match.group(5)),
+      isConstructor: isConstructor,
+      source: line,
+    );
+  }
+
+  /// The original source of this stack frame.
+  final String source;
+
+  /// The zero-indexed frame number.
+  ///
+  /// This value may be -1 to indicate an unknown frame number.
+  final int number;
+
+  /// The scheme of the package for this frame, e.g. "dart" for
+  /// dart:core/errors_patch.dart or "package" for
+  /// package:flutter/src/widgets/text.dart.
+  ///
+  /// The path property refers to the source file.
+  final String packageScheme;
+
+  /// The package for this frame, e.g. "core" for
+  /// dart:core/errors_patch.dart or "flutter" for
+  /// package:flutter/src/widgets/text.dart.
+  final String package;
+
+  /// The path of the file for this frame, e.g. "errors_patch.dart" for
+  /// dart:core/errors_patch.dart or "src/widgets/text.dart" for
+  /// package:flutter/src/widgets/text.dart.
+  final String packagePath;
+
+  /// The source line number.
+  final int line;
+
+  /// The source column number.
+  final int column;
+
+  /// The class name, if any, for this frame.
+  ///
+  /// This may be null for top level methods in a library or anonymous closure
+  /// methods.
+  final String className;
+
+  /// The method name for this frame.
+  ///
+  /// This will be an empty string if the stack frame is from the default
+  /// constructor.
+  final String method;
+
+  /// Whether or not this was thrown from a constructor.
+  final bool isConstructor;
+
+  @override
+  int get hashCode => hashValues(number, package, line, column, className, method, source);
+
+  @override
+  bool operator ==(Object other) {
+    if (runtimeType != other.runtimeType)
+      return false;
+    return other is StackFrame &&
+        number == other.number &&
+        package == other.package &&
+        line == other.line &&
+        column == other.column &&
+        className == other.className &&
+        method == other.method &&
+        source == other.source;
+  }
+
+  @override
+  String toString() => '$runtimeType(#$number, $packageScheme:$package/$packagePath:$line:$column, className: $className, method: $method)';
+}

packages/flutter/test/foundation/assertions_test.dart

@@ -352,4 +352,80 @@ void main() {
       expect(summary.value, equals(<String>['Invalid argument(s) (myArgument): Must not be null']));
     }
   });
+
+  test('Identifies user fault', () {
+    // User fault because they called `new Text(null)` from their own code.
+    final StackTrace stack = StackTrace.fromString('''#0      _AssertionError._doThrowNew (dart:core-patch/errors_patch.dart:42:39)
+#1      _AssertionError._throwNew (dart:core-patch/errors_patch.dart:38:5)
+#2      new Text (package:flutter/src/widgets/text.dart:287:10)
+#3      _MyHomePageState.build (package:hello_flutter/main.dart:72:16)
+#4      StatefulElement.build (package:flutter/src/widgets/framework.dart:4414:27)
+#5      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4303:15)
+#6      Element.rebuild (package:flutter/src/widgets/framework.dart:4027:5)
+#7      ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:4286:5)
+#8      StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4461:11)
+#9      ComponentElement.mount (package:flutter/src/widgets/framework.dart:4281:5)
+#10      Element.inflateWidget (package:flutter/src/widgets/framework.dart:3276:14)
+#11     Element.updateChild (package:flutter/src/widgets/framework.dart:3070:12)
+#12     SingleChildRenderObjectElement.mount (package:flutter/blah.dart:999:9)''');
+
+    final FlutterErrorDetails details = FlutterErrorDetails(
+      exception: AssertionError('Test assertion'),
+      stack: stack,
+    );
+
+    final DiagnosticPropertiesBuilder builder = DiagnosticPropertiesBuilder();
+    details.debugFillProperties(builder);
+
+    expect(builder.properties.length, 4);
+    expect(builder.properties[0].toString(), 'The following assertion was thrown:');
+    expect(builder.properties[1].toString(), 'Assertion failed');
+    expect(builder.properties[2] is ErrorSpacer, true);
+    final DiagnosticsStackTrace trace = builder.properties[3] as DiagnosticsStackTrace;
+    expect(trace, isNotNull);
+    expect(trace.value, stack);
+  });
+
+  test('Identifies our fault', () {
+    // Our fault because we should either have an assertion in `text_helper.dart`
+    // or we should make sure not to pass bad values into new Text.
+    final StackTrace stack = StackTrace.fromString('''#0      _AssertionError._doThrowNew (dart:core-patch/errors_patch.dart:42:39)
+#1      _AssertionError._throwNew (dart:core-patch/errors_patch.dart:38:5)
+#2      new Text (package:flutter/src/widgets/text.dart:287:10)
+#3      new SomeWidgetUsingText (package:flutter/src/widgets/text_helper.dart:287:10)
+#4      _MyHomePageState.build (package:hello_flutter/main.dart:72:16)
+#5      StatefulElement.build (package:flutter/src/widgets/framework.dart:4414:27)
+#6      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4303:15)
+#7      Element.rebuild (package:flutter/src/widgets/framework.dart:4027:5)
+#8      ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:4286:5)
+#9      StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4461:11)
+#10     ComponentElement.mount (package:flutter/src/widgets/framework.dart:4281:5)
+#11     Element.inflateWidget (package:flutter/src/widgets/framework.dart:3276:14)
+#12     Element.updateChild (package:flutter/src/widgets/framework.dart:3070:12)
+#13     SingleChildRenderObjectElement.mount (package:flutter/blah.dart:999:9)''');
+
+    final FlutterErrorDetails details = FlutterErrorDetails(
+      exception: AssertionError('Test assertion'),
+      stack: stack,
+    );
+
+    final DiagnosticPropertiesBuilder builder = DiagnosticPropertiesBuilder();
+    details.debugFillProperties(builder);
+    expect(builder.properties.length, 6);
+    expect(builder.properties[0].toString(), 'The following assertion was thrown:');
+    expect(builder.properties[1].toString(), 'Assertion failed');
+    expect(builder.properties[2] is ErrorSpacer, true);
+    expect(
+      builder.properties[3].toString(),
+      'Either the assertion indicates an error in the framework itself, or we should '
+      'provide substantially more information in this error message to help you determine '
+      'and fix the underlying cause.\n'
+      'In either case, please report this assertion by filing a bug on GitHub:\n'
+      '  https://github.com/flutter/flutter/issues/new?template=BUG.md',
+    );
+    expect(builder.properties[4] is ErrorSpacer, true);
+    final DiagnosticsStackTrace trace = builder.properties[5] as DiagnosticsStackTrace;
+    expect(trace, isNotNull);
+    expect(trace.value, stack);
+  });
 }

packages/flutter/test/foundation/diagnostics_test.dart

@@ -1849,18 +1849,18 @@ void main() {
 
   test('Stack trace test', () {
     final StackTrace stack = StackTrace.fromString(
-      '#0      someMethod()  file:///diagnostics_test.dart:42:19\n'
-      '#1      someMethod2()  file:///diagnostics_test.dart:12:3\n'
-      '#2      someMethod3()  file:///foo.dart:4:1\n'
+      '#0      someMethod  (file:///diagnostics_test.dart:42:19)\n'
+      '#1      someMethod2  (file:///diagnostics_test.dart:12:3)\n'
+      '#2      someMethod3  (file:///foo.dart:4:1)\n'
     );
 
     expect(
       DiagnosticsStackTrace('Stack trace', stack).toStringDeep(),
       equalsIgnoringHashCodes(
         'Stack trace:\n'
-        '#0      someMethod()  file:///diagnostics_test.dart:42:19\n'
-        '#1      someMethod2()  file:///diagnostics_test.dart:12:3\n'
-        '#2      someMethod3()  file:///foo.dart:4:1\n'
+        '#0      someMethod  (file:///diagnostics_test.dart:42:19)\n'
+        '#1      someMethod2  (file:///diagnostics_test.dart:12:3)\n'
+        '#2      someMethod3  (file:///foo.dart:4:1)\n'
       ),
     );
 
@@ -1868,9 +1868,9 @@ void main() {
       DiagnosticsStackTrace('-- callback 2 --', stack, showSeparator: false).toStringDeep(),
       equalsIgnoringHashCodes(
         '-- callback 2 --\n'
-        '#0      someMethod()  file:///diagnostics_test.dart:42:19\n'
-        '#1      someMethod2()  file:///diagnostics_test.dart:12:3\n'
-        '#2      someMethod3()  file:///foo.dart:4:1\n'
+        '#0      someMethod  (file:///diagnostics_test.dart:42:19)\n'
+        '#1      someMethod2  (file:///diagnostics_test.dart:12:3)\n'
+        '#2      someMethod3  (file:///foo.dart:4:1)\n'
       ),
     );
   });

packages/flutter/test/foundation/error_reporting_test.dart

@@ -45,13 +45,18 @@ Future<void> main() async {
 
   final StackTrace sampleStack = await getSampleStack();
 
-  test('Error reporting - pretest', () async {
+  setUp(() async {
     expect(debugPrint, equals(debugPrintThrottled));
     debugPrint = (String message, { int wrapWidth }) {
       console.add(message);
     };
   });
 
+  tearDown(() async {
+    expect(console, isEmpty);
+    debugPrint = debugPrintThrottled;
+  });
+
   test('Error reporting - assert with message', () async {
     expect(console, isEmpty);
     FlutterError.dumpErrorToConsole(FlutterErrorDetails(
@@ -71,11 +76,6 @@ Future<void> main() async {
       '\'[^\']+flutter/test/foundation/error_reporting_test\\.dart\':\n'
       'Failed assertion: line [0-9]+ pos [0-9]+: \'false\'\n'
       '\n'
-      'Either the assertion indicates an error in the framework itself, or we should provide substantially\n'
-      'more information in this error message to help you determine and fix the underlying cause\\.\n'
-      'In either case, please report this assertion by filing a bug on GitHub:\n'
-      '  https://github\\.com/flutter/flutter/issues/new\\?template=BUG\\.md\n'
-      '\n'
       'When the exception was thrown, this was the stack:\n'
       '#0      getSampleStack\\.<anonymous closure> \\([^)]+flutter/test/foundation/error_reporting_test\\.dart:[0-9]+:[0-9]+\\)\n'
       '#2      getSampleStack \\([^)]+flutter/test/foundation/error_reporting_test\\.dart:[0-9]+:[0-9]+\\)\n'
@@ -111,11 +111,6 @@ Future<void> main() async {
       'word word word word word word word word word word word word word word word word word word word word\n'
       '\'[^\']+flutter/test/foundation/error_reporting_test\\.dart\':\n'
       'Failed assertion: line [0-9]+ pos [0-9]+: \'false\'\n'
-      '\n'
-      'Either the assertion indicates an error in the framework itself, or we should provide substantially\n'
-      'more information in this error message to help you determine and fix the underlying cause\\.\n'
-      'In either case, please report this assertion by filing a bug on GitHub:\n'
-      '  https://github\\.com/flutter/flutter/issues/new\\?template=BUG\\.md\n'
       '════════════════════════════════════════════════════════════════════════════════════════════════════\$',
     ));
     console.clear();
@@ -153,11 +148,6 @@ Future<void> main() async {
       '\'[^\']+flutter/test/foundation/error_reporting_test\\.dart\':[\n ]'
       'Failed[\n ]assertion:[\n ]line[\n ][0-9]+[\n ]pos[\n ][0-9]+:[\n ]\'false\':[\n ]is[\n ]not[\n ]true\\.\n'
       '\n'
-      'Either the assertion indicates an error in the framework itself, or we should provide substantially\n'
-      'more information in this error message to help you determine and fix the underlying cause\\.\n'
-      'In either case, please report this assertion by filing a bug on GitHub:\n'
-      '  https://github\\.com/flutter/flutter/issues/new\\?template=BUG\\.md\n'
-      '\n'
       'When the exception was thrown, this was the stack:\n'
       '#0      getSampleStack\\.<anonymous closure> \\([^)]+flutter/test/foundation/error_reporting_test\\.dart:[0-9]+:[0-9]+\\)\n'
       '#2      getSampleStack \\([^)]+flutter/test/foundation/error_reporting_test\\.dart:[0-9]+:[0-9]+\\)\n'
@@ -219,9 +209,4 @@ Future<void> main() async {
     console.clear();
     FlutterError.resetErrorCount();
   });
-
-  test('Error reporting - posttest', () async {
-    expect(console, isEmpty);
-    debugPrint = debugPrintThrottled;
-  });
 }

packages/flutter/test/foundation/stack_frame_test.dart

+// Copyright 2014 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:flutter/foundation.dart';
+import '../flutter_test_alternative.dart';
+
+void main() {
+  test('Parses line', () {
+    expect(
+      StackFrame.fromStackTraceLine(stackString.split('\n')[0]),
+      stackFrames[0],
+    );
+  });
+
+  test('Parses string', () {
+    expect(
+      StackFrame.fromStackString(stackString),
+      stackFrames,
+    );
+  });
+
+  test('Parses StackTrace', () {
+    expect(
+      StackFrame.fromStackTrace(StackTrace.fromString(stackString)),
+      stackFrames,
+    );
+  });
+
+  test('Parses complex stack', () {
+    expect(
+      StackFrame.fromStackString(asyncStackString),
+      asyncStackFrames,
+    );
+  });
+
+  test('Parses stack without cols', () {
+    expect(
+      StackFrame.fromStackString(stackFrameNoCols),
+      stackFrameNoColsFrames,
+    );
+  });
+
+  test('Parses web stack', () {
+    expect(
+      StackFrame.fromStackString(webStackTrace),
+      webStackTraceFrames,
+    );
+  });
+}
+
+const String stackString = '''#0      _AssertionError._doThrowNew (dart:core-patch/errors_patch.dart:42:39)
+#1      _AssertionError._throwNew (dart:core-patch/errors_patch.dart:38:5)
+#2      new Text (package:flutter/src/widgets/text.dart:287:10)
+#3      _MyHomePageState.build (package:hello_flutter/main.dart:72:16)
+#4      StatefulElement.build (package:flutter/src/widgets/framework.dart:4414:27)
+#5      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4303:15)
+#6      Element.rebuild (package:flutter/src/widgets/framework.dart:4027:5)
+#7      ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:4286:5)
+#8      StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4461:11)
+#9      ComponentElement.mount (package:flutter/src/widgets/framework.dart:4281:5)
+#10     Element.inflateWidget (package:flutter/src/widgets/framework.dart:3276:14)
+#11     Element.updateChild (package:flutter/src/widgets/framework.dart)
+#12     SingleChildRenderObjectElement.mount (package:flutter/blah.dart:999:9)
+#13     main (package:hello_flutter/main.dart:10:4)''';
+
+const List<StackFrame> stackFrames = <StackFrame>[
+  StackFrame(number: 0,  className: '_AssertionError',                method: '_doThrowNew',    packageScheme: 'dart',    package: 'core-patch',    packagePath: 'errors_patch.dart',          line: 42,   column: 39, source: '#0      _AssertionError._doThrowNew (dart:core-patch/errors_patch.dart:42:39)'),
+  StackFrame(number: 1,  className: '_AssertionError',                method: '_throwNew',      packageScheme: 'dart',    package: 'core-patch',    packagePath: 'errors_patch.dart',          line: 38,   column: 5, source: '#1      _AssertionError._throwNew (dart:core-patch/errors_patch.dart:38:5)'),
+  StackFrame(number: 2,  className: 'Text',                           method: '',               packageScheme: 'package', package: 'flutter',       packagePath: 'src/widgets/text.dart',      line: 287,  column: 10, isConstructor: true, source: '#2      new Text (package:flutter/src/widgets/text.dart:287:10)'),
+  StackFrame(number: 3,  className: '_MyHomePageState',               method: 'build',          packageScheme: 'package', package: 'hello_flutter', packagePath: 'main.dart',                  line: 72,   column: 16, source: '#3      _MyHomePageState.build (package:hello_flutter/main.dart:72:16)'),
+  StackFrame(number: 4,  className: 'StatefulElement',                method: 'build',          packageScheme: 'package', package: 'flutter',       packagePath: 'src/widgets/framework.dart', line: 4414, column: 27, source: '#4      StatefulElement.build (package:flutter/src/widgets/framework.dart:4414:27)'),
+  StackFrame(number: 5,  className: 'ComponentElement',               method: 'performRebuild', packageScheme: 'package', package: 'flutter',       packagePath: 'src/widgets/framework.dart', line: 4303, column: 15, source: '#5      ComponentElement.performRebuild (package:flutter/src/widgets/framework.dart:4303:15)'),
+  StackFrame(number: 6,  className: 'Element',                        method: 'rebuild',        packageScheme: 'package', package: 'flutter',       packagePath: 'src/widgets/framework.dart', line: 4027, column: 5, source: '#6      Element.rebuild (package:flutter/src/widgets/framework.dart:4027:5)'),
+  StackFrame(number: 7,  className: 'ComponentElement',               method: '_firstBuild',    packageScheme: 'package', package: 'flutter',       packagePath: 'src/widgets/framework.dart', line: 4286, column: 5, source: '#7      ComponentElement._firstBuild (package:flutter/src/widgets/framework.dart:4286:5)'),
+  StackFrame(number: 8,  className: 'StatefulElement',                method: '_firstBuild',    packageScheme: 'package', package: 'flutter',       packagePath: 'src/widgets/framework.dart', line: 4461, column: 11, source: '#8      StatefulElement._firstBuild (package:flutter/src/widgets/framework.dart:4461:11)'),
+  StackFrame(number: 9,  className: 'ComponentElement',               method: 'mount',          packageScheme: 'package', package: 'flutter',       packagePath: 'src/widgets/framework.dart', line: 4281, column: 5, source: '#9      ComponentElement.mount (package:flutter/src/widgets/framework.dart:4281:5)'),
+  StackFrame(number: 10, className: 'Element',                        method: 'inflateWidget',  packageScheme: 'package', package: 'flutter',       packagePath: 'src/widgets/framework.dart', line: 3276, column: 14, source: '#10     Element.inflateWidget (package:flutter/src/widgets/framework.dart:3276:14)'),
+  StackFrame(number: 11, className: 'Element',                        method: 'updateChild',    packageScheme: 'package', package: 'flutter',       packagePath: 'src/widgets/framework.dart', line: -1,   column: -1, source: '#11     Element.updateChild (package:flutter/src/widgets/framework.dart)'),
+  StackFrame(number: 12, className: 'SingleChildRenderObjectElement', method: 'mount',          packageScheme: 'package', package: 'flutter',       packagePath: 'blah.dart',                  line: 999,  column: 9, source: '#12     SingleChildRenderObjectElement.mount (package:flutter/blah.dart:999:9)'),
+  StackFrame(number: 13, className: '',                               method: 'main',           packageScheme: 'package', package: 'hello_flutter', packagePath: 'main.dart',                  line: 10,   column: 4, source: '#13     main (package:hello_flutter/main.dart:10:4)'),
+];
+
+
+const String asyncStackString = '''#0      getSampleStack.<anonymous closure> (file:///path/to/flutter/packages/flutter/test/foundation/error_reporting_test.dart:40:57)
+#1      new Future.sync (dart:async/future.dart:224:31)
+#2      getSampleStack (file:///path/to/flutter/packages/flutter/test/foundation/error_reporting_test.dart:40:10)
+#3      main (file:///path/to/flutter/packages/flutter/test/foundation/error_reporting_test.dart:46:40)
+#4      main (package:flutter_goldens/flutter_goldens.dart:43:17)
+<asynchronous suspension>
+#5      main.<anonymous closure>.<anonymous closure> (file:///temp/path.whatever/listener.dart:47:18)
+#6      _rootRun (dart:async/zone.dart:1126:13)
+#7      _CustomZone.run (dart:async/zone.dart:1023:19)
+#8      _runZoned (dart:async/zone.dart:1518:10)
+#9      runZoned (dart:async/zone.dart:1465:12)
+#10     Declarer.declare (package:test_api/src/backend/declarer.dart:130:22)
+#11     RemoteListener.start.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:test_api/src/remote_listener.dart:124:26)
+<asynchronous suspension>
+#12     _rootRun (dart:async/zone.dart:1126:13)
+#13     _CustomZone.run (dart:async/zone.dart:1023:19)
+#14     _runZoned (dart:async/zone.dart:1518:10)
+#15     runZoned (dart:async/zone.dart:1502:12)
+#16     RemoteListener.start.<anonymous closure>.<anonymous closure> (package:test_api/src/remote_listener.dart:70:9)
+#17     _rootRun (dart:async/zone.dart:1126:13)
+#18     _CustomZone.run (dart:async/zone.dart:1023:19)
+#19     _runZoned (dart:async/zone.dart:1518:10)
+#20     runZoned (dart:async/zone.dart:1465:12)
+#21     StackTraceFormatter.asCurrent (package:test_api/src/backend/stack_trace_formatter.dart:41:31)
+#22     RemoteListener.start.<anonymous closure> (package:test_api/src/remote_listener.dart:69:29)
+#23     _rootRun (dart:async/zone.dart:1126:13)
+#24     _CustomZone.run (dart:async/zone.dart:1023:19)
+#25     _runZoned (dart:async/zone.dart:1518:10)
+#26     runZoned (dart:async/zone.dart:1465:12)
+#27     SuiteChannelManager.asCurrent (package:test_api/src/suite_channel_manager.dart:34:31)
+#28     RemoteListener.start (package:test_api/src/remote_listener.dart:68:27)
+#29     serializeSuite (file:///temp/path.whatever/listener.dart:17:25)
+#30     main (file:///temp/path.whatever/listener.dart:43:36)
+#31     _runMainZoned.<anonymous closure>.<anonymous closure> (dart:ui/hooks.dart:239:25)
+#32     _rootRun (dart:async/zone.dart:1126:13)
+#33     _CustomZone.run (dart:async/zone.dart:1023:19)
+#34     _runZoned (dart:async/zone.dart:1518:10)
+#35     runZoned (dart:async/zone.dart:1502:12)
+#36     _runMainZoned.<anonymous closure> (dart:ui/hooks.dart:231:5)
+#37     _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:307:19)
+#38     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:174:12)''';
+
+const List<StackFrame> asyncStackFrames = <StackFrame>[
+  StackFrame(number: 0,  className: '',                    method: 'getSampleStack', packageScheme: 'file',    package: '<unknown>',       packagePath: '/path/to/flutter/packages/flutter/test/foundation/error_reporting_test.dart', line: 40,   column: 57, source: '#0      getSampleStack.<anonymous closure> (file:///path/to/flutter/packages/flutter/test/foundation/error_reporting_test.dart:40:57)'),
+  StackFrame(number: 1,  className: 'Future',              method: 'sync',           packageScheme: 'dart',    package: 'async',           packagePath: 'future.dart',                                                                 line: 224,  column: 31, isConstructor: true, source: '#1      new Future.sync (dart:async/future.dart:224:31)'),
+  StackFrame(number: 2,  className: '',                    method: 'getSampleStack', packageScheme: 'file',    package: '<unknown>',       packagePath: '/path/to/flutter/packages/flutter/test/foundation/error_reporting_test.dart', line: 40,   column: 10, source: '#2      getSampleStack (file:///path/to/flutter/packages/flutter/test/foundation/error_reporting_test.dart:40:10)'),
+  StackFrame(number: 3,  className: '',                    method: 'main',           packageScheme: 'file',    package: '<unknown>',       packagePath: '/path/to/flutter/packages/flutter/foundation/error_reporting_test.dart',      line: 46,   column: 40, source: '#3      main (file:///path/to/flutter/packages/flutter/test/foundation/error_reporting_test.dart:46:40)'),
+  StackFrame(number: 4,  className: '',                    method: 'main',           packageScheme: 'package', package: 'flutter_goldens', packagePath: 'flutter_goldens.dart',                                                        line: 43,   column: 17, source: '#4      main (package:flutter_goldens/flutter_goldens.dart:43:17)'),
+  StackFrame.asynchronousSuspension,
+  StackFrame(number: 5,  className: '',                    method: 'main',           packageScheme: 'file',    package: '<unknown>',      packagePath: '/temp/path.whatever/listener.dart',                                           line: 47,   column: 18, source: '#5      main.<anonymous closure>.<anonymous closure> (file:///temp/path.whatever/listener.dart:47:18)'),
+  StackFrame(number: 6,  className: '',                    method: '_rootRun',       packageScheme: 'dart',    package: 'async',          packagePath: 'zone.dart',                                                                   line: 1126, column: 13, source: '#6      _rootRun (dart:async/zone.dart:1126:13)'),
+  StackFrame(number: 7,  className: '_CustomZone',         method: 'run',            packageScheme: 'dart',    package: 'async',          packagePath: 'zone.dart',                                                                   line: 1023, column: 19, source: '#7      _CustomZone.run (dart:async/zone.dart:1023:19)'),
+  StackFrame(number: 8,  className: '',                    method: '_runZoned',      packageScheme: 'dart',    package: 'async',          packagePath: 'zone.dart',                                                                   line: 1518, column: 10, source: '#8      _runZoned (dart:async/zone.dart:1518:10)'),
+  StackFrame(number: 9,  className: '',                    method: 'runZoned',       packageScheme: 'dart',    package: 'async',          packagePath: 'zone.dart',                                                                   line: 1465, column: 12, source: '#9      runZoned (dart:async/zone.dart:1465:12)'),
+  StackFrame(number: 10, className: 'Declarer',            method: 'declare',        packageScheme: 'package', package: 'test_api',       packagePath: 'src/backend/declarer.dart',                                                   line: 130,  column: 22, source: '#10     Declarer.declare (package:test_api/src/backend/declarer.dart:130:22)'),
+  StackFrame(number: 11, className: 'RemoteListener',      method: 'start',          packageScheme: 'package', package: 'test_api',       packagePath: 'src/remote_listener.dart',                                                    line: 124,  column: 26, source: '#11     RemoteListener.start.<anonymous closure>.<anonymous closure>.<anonymous closure> (package:test_api/src/remote_listener.dart:124:26)'),
+  StackFrame.asynchronousSuspension,
+  StackFrame(number: 12, className: '',                    method: '_rootRun',       packageScheme: 'dart',    package: 'async',          packagePath: 'zone.dart',                                                                   line: 1126, column: 13, source: '#12     _rootRun (dart:async/zone.dart:1126:13)'),
+  StackFrame(number: 13, className: '_CustomZone',         method: 'run' ,           packageScheme: 'dart',    package: 'async',          packagePath: 'zone.dart',                                                                   line: 1023, column: 19, source: '#13     _CustomZone.run (dart:async/zone.dart:1023:19)'),
+  StackFrame(number: 14, className: '',                    method: '_runZoned',      packageScheme: 'dart',    package: 'async',          packagePath: 'zone.dart',                                                                   line: 1518, column: 10, source: '#14     _runZoned (dart:async/zone.dart:1518:10)'),
+  StackFrame(number: 15, className: '',                    method: 'runZoned',       packageScheme: 'dart',    package: 'async',          packagePath: 'zone.dart',                                                                   line: 1502, column: 12, source: '#15     runZoned (dart:async/zone.dart:1502:12)'),
+  StackFrame(number: 16, className: 'RemoteListener',      method: 'start',          packageScheme: 'package', package: 'test_api',       packagePath: 'src/remote_listener.dart',                                                    line: 70,   column: 9, source: '#16     RemoteListener.start.<anonymous closure>.<anonymous closure> (package:test_api/src/remote_listener.dart:70:9)'),
+  StackFrame(number: 17, className: '',                    method: '_rootRun',       packageScheme: 'dart',    package: 'async',          packagePath: 'zone.dart',                                                                   line: 1126, column: 13, source: '#17     _rootRun (dart:async/zone.dart:1126:13)'),
+  StackFrame(number: 18, className: '_CustomZone',         method: 'run',            packageScheme: 'dart',    package: 'async',          packagePath: 'zone.dart',                                                                   line: 1023, column: 19, source: '#18     _CustomZone.run (dart:async/zone.dart:1023:19)'),
+  StackFrame(number: 19, className: '',                    method: '_runZoned',      packageScheme: 'dart',    package: 'async',          packagePath: 'zone.dart',                                                                   line: 1518, column: 10, source: '#19     _runZoned (dart:async/zone.dart:1518:10)'),
+  StackFrame(number: 20, className: '',                    method: 'runZoned',       packageScheme: 'dart',    package: 'async',          packagePath: 'zone.dart',                                                                   line: 1465, column: 12, source: '#20     runZoned (dart:async/zone.dart:1465:12)'),
+  StackFrame(number: 21, className: 'StackTraceFormatter', method: 'asCurrent',      packageScheme: 'package', package: 'test_api',       packagePath: 'src/backend/stack_trace_formatter.dart',                                      line: 41,   column: 31, source: '#21     StackTraceFormatter.asCurrent (package:test_api/src/backend/stack_trace_formatter.dart:41:31)'),
+  StackFrame(number: 22, className: 'RemoteListener',      method: 'start',          packageScheme: 'package', package: 'test_api',       packagePath: 'src/remote_listener.dart',                                                    line: 69,   column: 29, source: '#22     RemoteListener.start.<anonymous closure> (package:test_api/src/remote_listener.dart:69:29)'),
+  StackFrame(number: 23, className: '',                    method: '_rootRun',       packageScheme: 'dart',    package: 'async',          packagePath: 'zone.dart',                                                                   line: 1126, column: 13, source: '#23     _rootRun (dart:async/zone.dart:1126:13)'),
+  StackFrame(number: 24, className: '_CustomZone',         method: 'run',            packageScheme: 'dart',    package: 'async',          packagePath: 'zone.dart',                                                                   line: 1023, column: 19, source: '#24     _CustomZone.run (dart:async/zone.dart:1023:19)'),
+  StackFrame(number: 25, className: '',                    method: '_runZoned',      packageScheme: 'dart',    package: 'async',          packagePath: 'zone.dart',                                                                   line: 1518, column: 10, source: '#25     _runZoned (dart:async/zone.dart:1518:10)'),
+  StackFrame(number: 26, className: '',                    method: 'runZoned',       packageScheme: 'dart',    package: 'async',          packagePath: 'zone.dart',                                                                   line: 1465, column: 12, source: '#26     runZoned (dart:async/zone.dart:1465:12)'),
+  StackFrame(number: 27, className: 'SuiteChannelManager', method: 'asCurrent',      packageScheme: 'package', package: 'test_api',       packagePath: 'src/suite_channel_manager.dart',                                              line: 34,   column: 31, source: '#27     SuiteChannelManager.asCurrent (package:test_api/src/suite_channel_manager.dart:34:31)'),
+  StackFrame(number: 28, className: 'RemoteListener',      method: 'start',          packageScheme: 'package', package: 'test_api',       packagePath: 'src/remote_listener.dart',                                                    line: 68,   column: 27, source: '#28     RemoteListener.start (package:test_api/src/remote_listener.dart:68:27)'),
+  StackFrame(number: 29, className: '',                    method: 'serializeSuite', packageScheme: 'file',    package: '<unknown>',      packagePath: '/temp/path.whatever/listener.dart',                                           line: 17,   column: 25, source: '#29     serializeSuite (file:///temp/path.whatever/listener.dart:17:25)'),
+  StackFrame(number: 30, className: '',                    method: 'main',           packageScheme: 'file',    package: '<unknown>',      packagePath: '/temp/path.whatever/listener.dart',                                           line: 43,   column: 36, source: '#30     main (file:///temp/path.whatever/listener.dart:43:36)'),
+  StackFrame(number: 31, className: '',                    method: '_runMainZoned',  packageScheme: 'dart',    package: 'ui',             packagePath: 'hooks.dart',                                                                  line:239,   column: 25, source: '#31     _runMainZoned.<anonymous closure>.<anonymous closure> (dart:ui/hooks.dart:239:25)'),
+  StackFrame(number: 32, className: '',                    method: '_rootRun',       packageScheme: 'dart',    package: 'async',          packagePath: 'zone.dart',                                                                   line: 1126, column: 13, source: '#32     _rootRun (dart:async/zone.dart:1126:13)'),
+  StackFrame(number: 33, className: '_CustomZone',         method: 'run' ,           packageScheme: 'dart',    package: 'async',          packagePath: 'zone.dart',                                                                   line: 1023, column: 19, source: '#33     _CustomZone.run (dart:async/zone.dart:1023:19)'),
+  StackFrame(number: 34, className: '',                    method: '_runZoned',      packageScheme: 'dart',    package: 'async',          packagePath: 'zone.dart',                                                                   line: 1518, column: 10, source: '#34     _runZoned (dart:async/zone.dart:1518:10)'),
+  StackFrame(number: 35, className: '',                    method: 'runZoned',       packageScheme: 'dart',    package: 'async',          packagePath: 'zone.dart',                                                                   line: 1502, column: 12, source: '#35     runZoned (dart:async/zone.dart:1502:12)'),
+  StackFrame(number: 36, className: '',                    method: '_runMainZoned',  packageScheme: 'dart',    package: 'ui',             packagePath: 'hooks.dart',                                                                  line: 231,  column: 5, source: '#36     _runMainZoned.<anonymous closure> (dart:ui/hooks.dart:231:5)'),
+  StackFrame(number: 37, className: '',                    method: '_startIsolate',  packageScheme: 'dart',    package: 'isolate-patch',  packagePath: 'isolate_patch.dart',                                                          line: 307,  column: 19, source: '#37     _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:307:19)'),
+  StackFrame(number: 38, className: '_RawReceivePortImpl', method: '_handleMessage', packageScheme: 'dart',    package: 'isolate-patch',  packagePath: 'isolate_patch.dart',                                                          line: 174,  column: 12, source: '#38     _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:174:12)'),
+];
+
+const String stackFrameNoCols = '''#0      blah (package:assertions/main.dart:4)
+#1      main (package:assertions/main.dart:8)
+#2      _runMainZoned.<anonymous closure>.<anonymous closure> (dart:ui/hooks.dart:239)
+#3      _rootRun (dart:async/zone.dart:1126)
+#4      _CustomZone.run (dart:async/zone.dart:1023)
+#5      _runZoned (dart:async/zone.dart:1518)
+#6      runZoned (dart:async/zone.dart:1502)
+#7      _runMainZoned.<anonymous closure> (dart:ui/hooks.dart:231)
+#8      _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:307)
+#9      _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:174)''';
+
+const List<StackFrame> stackFrameNoColsFrames = <StackFrame>[
+  StackFrame(number: 0,  className: '',                    method: 'blah',           packageScheme: 'package', package: 'assertions',    packagePath: 'main.dart',          line: 4,    column: -1, source: '#0      blah (package:assertions/main.dart:4)'),
+  StackFrame(number: 1,  className: '',                    method: 'main',           packageScheme: 'package', package: 'assertions',    packagePath: 'main.dart',          line: 8,    column: -1, source: '#1      main (package:assertions/main.dart:8)'),
+  StackFrame(number: 2,  className: '',                    method: '_runMainZoned',  packageScheme: 'dart',    package: 'ui',            packagePath: 'hooks.dart',         line: 239,  column: -1, source: '#2      _runMainZoned.<anonymous closure>.<anonymous closure> (dart:ui/hooks.dart:239)'),
+  StackFrame(number: 3,  className: '',                    method: '_rootRun',       packageScheme: 'dart',    package: 'async',         packagePath: 'zone.dart',          line: 1126, column: -1, source: '#3      _rootRun (dart:async/zone.dart:1126)'),
+  StackFrame(number: 4,  className: '_CustomZone',         method: 'run',            packageScheme: 'dart',    package: 'async',         packagePath: 'zone.dart',          line: 1023, column: -1, source: '#4      _CustomZone.run (dart:async/zone.dart:1023)'),
+  StackFrame(number: 5,  className: '',                    method: '_runZoned',      packageScheme: 'dart',    package: 'async',         packagePath: 'zone.dart',          line: 1518, column: -1, source: '#5      _runZoned (dart:async/zone.dart:1518)'),
+  StackFrame(number: 6,  className: '',                    method: 'runZoned',       packageScheme: 'dart',    package: 'async',         packagePath: 'zone.dart',          line: 1502, column: -1, source: '#6      runZoned (dart:async/zone.dart:1502)'),
+  StackFrame(number: 7,  className: '',                    method: '_runMainZoned',  packageScheme: 'dart',    package: 'ui',            packagePath: 'hooks.dart',         line: 231,  column: -1, source: '#7      _runMainZoned.<anonymous closure> (dart:ui/hooks.dart:231)'),
+  StackFrame(number: 8,  className: '',                    method: '_startIsolate',  packageScheme: 'dart',    package: 'isolate-patch', packagePath: 'isolate-patch.dart', line: 307,  column: -1, source: '#8      _startIsolate.<anonymous closure> (dart:isolate-patch/isolate_patch.dart:307)'),
+  StackFrame(number: 9,  className: '_RawReceivePortImpl', method: '_handleMessage', packageScheme: 'dart',    package: 'isolate-patch', packagePath: 'isolate-patch.dart', line: 174,  column: -1, source: '#9      _RawReceivePortImpl._handleMessage (dart:isolate-patch/isolate_patch.dart:174)'),
+];
+
+const String webStackTrace = r'''package:dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 196:49  throw_
+package:assertions/main.dart 4:3                                                      blah
+package:assertions/main.dart 8:5                                                      main$
+package:assertions/main_web_entrypoint.dart 9:3                                       main$
+package:dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 47:50            onValue
+package:dart-sdk/lib/async/zone.dart 1381:54                                          runUnary
+object_test.dart 210:5                                                                performLayout
+package:dart-sdk/lib/async/future_impl.dart 140:18                                    handleValue
+package:dart-sdk/lib/async/future_impl.dart 682:44                                    handleValueCallback
+package:dart-sdk/lib/async/future_impl.dart 711:32                                    _propagateToListeners
+package:dart-sdk/lib/async/future_impl.dart 391:9                                     callback
+package:dart-sdk/lib/async/schedule_microtask.dart 43:11                              _microtaskLoop
+package:dart-sdk/lib/async/schedule_microtask.dart 52:5                               _startMicrotaskLoop
+package:dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 168:15           <fn>''';
+
+const List<StackFrame> webStackTraceFrames = <StackFrame>[
+  StackFrame(number: -1, className: '<unknown>', method: 'throw_',                packageScheme: 'package',   package: 'dart-sdk',   packagePath: 'lib/_intenral/js_dev_runtime/private/ddc_runtime/errors.dart', line: 196,  column: 49, source: 'package:dart-sdk/lib/_internal/js_dev_runtime/private/ddc_runtime/errors.dart 196:49  throw_'),
+  StackFrame(number: -1, className: '<unknown>', method: 'blah',                  packageScheme: 'package',   package: 'assertions', packagePath: 'main.dart',                                                    line: 4,    column: 3, source: 'package:assertions/main.dart 4:3                                                      blah'),
+  StackFrame(number: -1, className: '<unknown>', method: r'main$',                packageScheme: 'package',   package: 'assertions', packagePath: 'main.dart',                                                    line: 8,    column: 5, source: r'package:assertions/main.dart 8:5                                                      main$'),
+  StackFrame(number: -1, className: '<unknown>', method: r'main$',                packageScheme: 'package',   package: 'assertions', packagePath: 'main_web_entrypoint.dart',                                     line: 9,    column: 3, source: r'package:assertions/main_web_entrypoint.dart 9:3                                       main$'),
+  StackFrame(number: -1, className: '<unknown>', method: 'onValue',               packageScheme: 'package',   package: 'dart-sdk',   packagePath: 'lib/_internal/js_dev_runtime/patch/async_patch.dart',          line: 47,   column: 50, source: 'package:dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 47:50            onValue'),
+  StackFrame(number: -1, className: '<unknown>', method: 'runUnary',              packageScheme: 'package',   package: 'dart-sdk',   packagePath: 'lib/async/zone.dart',                                          line: 1381, column: 54, source: 'package:dart-sdk/lib/async/zone.dart 1381:54                                          runUnary'),
+  StackFrame(number: -1, className: '<unknown>', method: 'performLayout',         packageScheme: '<unknown>', package: '<unknown>',  packagePath: '<unknown>',                                                    line: 210,  column: 5, source: 'object_test.dart 210:5                                                                performLayout'),
+  StackFrame(number: -1, className: '<unknown>', method: 'handleValue',           packageScheme: 'package',   package: 'dart-sdk',   packagePath: 'lib/async/future_impl.dart',                                   line: 140,  column: 18, source: 'package:dart-sdk/lib/async/future_impl.dart 140:18                                    handleValue'),
+  StackFrame(number: -1, className: '<unknown>', method: 'handleValueCallback',   packageScheme: 'package',   package: 'dart-sdk',   packagePath: 'lib/async/future_impl.dart',                                   line: 682,  column: 44, source: 'package:dart-sdk/lib/async/future_impl.dart 682:44                                    handleValueCallback'),
+  StackFrame(number: -1, className: '<unknown>', method: '_propagateToListeners', packageScheme: 'package',   package: 'dart-sdk',   packagePath: 'lib/async/future_impl.dart',                                   line: 711,  column: 32, source: 'package:dart-sdk/lib/async/future_impl.dart 711:32                                    _propagateToListeners'),
+  StackFrame(number: -1, className: '<unknown>', method: 'callback',              packageScheme: 'package',   package: 'dart-sdk',   packagePath: 'lib/async/future_impl.dart',                                   line: 391,  column: 9, source: 'package:dart-sdk/lib/async/future_impl.dart 391:9                                     callback'),
+  StackFrame(number: -1, className: '<unknown>', method: '_microtaskLoop',        packageScheme: 'package',   package: 'dart-sdk',   packagePath: 'lib/async/schedule_microtask.dart',                            line: 43,   column: 11, source: 'package:dart-sdk/lib/async/schedule_microtask.dart 43:11                              _microtaskLoop'),
+  StackFrame(number: -1, className: '<unknown>', method: '_startMicrotaskLoop',   packageScheme: 'package',   package: 'dart-sdk',   packagePath: 'lib/async/schedule_microtask.dart',                            line: 52,   column: 5, source: 'package:dart-sdk/lib/async/schedule_microtask.dart 52:5                               _startMicrotaskLoop'),
+  StackFrame(number: -1, className: '<unknown>', method: '<fn>',                  packageScheme: 'package',   package: 'dart-sdk',   packagePath: 'lib/_internal/js_dev_runtime/patch/async_patch.dart',          line: 168,  column: 15, source: 'package:dart-sdk/lib/_internal/js_dev_runtime/patch/async_patch.dart 168:15           <fn>'),
+];