Regenerate pub sources.

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
index f3851a5e948dfa1f14aec16977cb9a5f6c95f040..dd2fb6ca4d1f5ca7cc0687ab81b6fefb362fdbd3 100644
--- a/sdk/lib/_internal/pub_generated/lib/src/exceptions.dart
+++ b/sdk/lib/_internal/pub_generated/lib/src/exceptions.dart
@@ -1,69 +1,129 @@
+// 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: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 command usage exceptions.
 class UsageException extends ApplicationException {
+  /// The command usage information.
   String _usage;
-  UsageException(String message, this._usage) : super(message);
+
+  UsageException(String message, this._usage)
+      : super(message);
+
   String toString() => "$message\n\n$_usage";
 }
+
+/// 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);
+  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',
-        'ClientException',
-        'AnalyzerError',
-        'AnalyzerErrorGroup',
-        'IsolateSpawnException',
-        'CertificateException',
-        'FileSystemException',
-        'HandshakeException',
-        'HttpException',
-        'IOException',
-        'ProcessException',
-        'RedirectException',
-        'SignalException',
-        'SocketException',
-        'StdoutException',
-        'TlsException',
-        'WebSocketException']);
+    ['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 ||