Revert "Revert "Use native async/await support in pub.""

sdk/lib/_internal/pub_generated/lib/src/exceptions.dart

Index: sdk/lib/_internal/pub_generated/lib/src/exceptions.dart
diff --git a/sdk/lib/_internal/pub_generated/lib/src/exceptions.dart b/sdk/lib/_internal/pub_generated/lib/src/exceptions.dart
deleted file mode 100644
index 7d4f5a39b924a01604f200ad93a0e146350f8edb..0000000000000000000000000000000000000000
--- a/sdk/lib/_internal/pub_generated/lib/src/exceptions.dart
+++ /dev/null
@@ -1,125 +0,0 @@
-// Copyright (c) 2014, 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.
-
-library pub.exceptions;
-
-import 'dart:io';
-import 'dart:isolate';
-
-import "package:analyzer/analyzer.dart";
-import 'package:args/command_runner.dart';
-import "package:http/http.dart" as http;
-import "package:stack_trace/stack_trace.dart";
-import "package:yaml/yaml.dart";
-
-import '../../asset/dart/serialize.dart';
-
-/// An exception class for exceptions that are intended to be seen by the user.
-///
-/// These exceptions won't have any debugging information printed when they're
-/// thrown.
-class ApplicationException implements Exception {
-  final String message;
-
-  ApplicationException(this.message);
-
-  String toString() => message;
-}
-
-/// An exception class for exceptions that are intended to be seen by the user
-/// and are associated with a problem in a file at some path.
-class FileException implements ApplicationException {
-  final String message;
-
-  /// The path to the file that was missing or erroneous.
-  final String path;
-
-  FileException(this.message, this.path);
-
-  String toString() => message;
-}
-
-/// A class for exceptions that wrap other exceptions.
-class WrappedException extends ApplicationException {
-  /// The underlying exception that [this] is wrapping, if any.
-  final innerError;
-
-  /// The stack chain for [innerError] if it exists.
-  final Chain innerChain;
-
-  WrappedException(String message, this.innerError, [StackTrace innerTrace])
-      : innerChain = innerTrace == null ? null : new Chain.forTrace(innerTrace),
-        super(message);
-}
-
-/// A class for exceptions that shouldn't be printed at the top level.
-///
-/// This is usually used when an exception has already been printed using
-/// [log.exception].
-class SilentException extends WrappedException {
-  SilentException(innerError, [StackTrace innerTrace])
-      : super(innerError.toString(), innerError, innerTrace);
-}
-
-/// A class for errors in a command's input data.
-///
-/// This corresponds to the [exit_codes.DATA] exit code.
-class DataException extends ApplicationException {
-  DataException(String message)
-      : super(message);
-}
-
-/// An class for exceptions where a package could not be found in a [Source].
-///
-/// The source is responsible for wrapping its internal exceptions in this so
-/// that other code in pub can use this to show a more detailed explanation of
-/// why the package was being requested.
-class PackageNotFoundException extends WrappedException {
-  PackageNotFoundException(String message, [innerError, StackTrace innerTrace])
-      : super(message, innerError, innerTrace);
-}
-
-/// All the names of user-facing exceptions.
-final _userFacingExceptions = new Set<String>.from(
-    ['ApplicationException', 'GitException', // This refers to http.ClientException.
-  'ClientException',
-      // Errors coming from the Dart analyzer are probably caused by syntax errors
-  // in user code, so they're user-facing.
-  'AnalyzerError',
-      'AnalyzerErrorGroup',
-      // An error spawning an isolate probably indicates a transformer with an
-  // invalid import.
-  'IsolateSpawnException', // IOException and subclasses.
-  'CertificateException',
-      'FileSystemException',
-      'HandshakeException',
-      'HttpException',
-      'IOException',
-      'ProcessException',
-      'RedirectException',
-      'SignalException',
-      'SocketException',
-      'StdoutException',
-      'TlsException',
-      'WebSocketException']);
-
-/// Returns whether [error] is a user-facing error object.
-///
-/// This includes both [ApplicationException] and any dart:io errors.
-bool isUserFacingException(error) {
-  if (error is CrossIsolateException) {
-    return _userFacingExceptions.contains(error.type);
-  }
-
-  // TODO(nweiz): unify this list with _userFacingExceptions when issue 5897 is
-  // fixed.
-  return error is ApplicationException ||
-      error is AnalyzerError ||
-      error is AnalyzerErrorGroup ||
-      error is IsolateSpawnException ||
-      error is IOException ||
-      error is http.ClientException ||
-      error is YamlException ||
-      error is UsageException;
-}