Fix the pubspec and warnings in pkg/kernel.

pkg/kernel/test/treeshaker_stacktracer.dart

-// Copyright (c) 2016, 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 kernel.treeshaker.stacktracer;
-
-import 'package:kernel/kernel.dart';
-import 'package:kernel/transformations/treeshaker.dart';
-import 'dart:io';
-import 'package:ansicolor/ansicolor.dart';

[asgerf, 2016/11/23 13:31:56]

This depends on the ansicolor package which is not in the SDK.

-
-String usage = '''
-USAGE: treeshaker_stacktracer FILE.dill STACKTRACE.txt
-
-Given a program and a stack trace from it, highlight the stack trace entries
-that the tree shaker marked as unreachable.  These are indicative of bugs
-in the tree shaker since their presence in the stack trace proves them reachable.
-
-Example usage:
-  ${comment("# Not shown: insert a 'throw' in testcase.dart")}
-  dart testcase.dart > error.txt  ${comment("# Get the stack trace")}
-  dartk testcase.dart -l -otestcase.dill  ${comment("# Compile binary")}
-  dart test/treeshaker_stacktracer.dart testcase.dill error.txt ${comment("# Analyze")}
-''';
-
-String legend = '''
-Legend:
-    ${reachable('reachable member')} or ${reachable('instantiated class')}
-    ${unreachable('unreachable member')} or ${unreachable('uninstantiated class')}
-    ${unknown('name unrecognized')}
-''';
-
-// TODO: Also support the stack trace format from stack_trace.
-RegExp stackTraceEntry = new RegExp(r'(#[0-9]+\s+)([a-zA-Z0-9_$.&<> ]+) \((.*)\)');
-
-AnsiPen reachable = new AnsiPen()..green();
-AnsiPen unreachable = new AnsiPen()..red();
-AnsiPen unknown = new AnsiPen()..gray(level: 0.5);
-AnsiPen filecolor = new AnsiPen()..gray(level: 0.5);
-AnsiPen comment = new AnsiPen()..gray(level: 0.5);
-
-String stackTraceName(Member member) {
-  String name = member.name?.name;
-  String className = member.enclosingClass?.name;
-  if (member is Constructor && name != null) {
-    return '$className.$className';
-  } else if (className != null) {
-    return '$className.$name';
-  } else {
-    return name;
-  }
-}
-
-int findReachablePrefix(String name, Set<String> strings) {
-  for (int index = name.length;
-      index > 0;
-      index = name.lastIndexOf('.', index - 1)) {
-    if (strings.contains(name.substring(0, index))) {
-      return index;
-    }
-  }
-  return 0;
-}
-
-String shortenFilename(String filename) {
-  if (filename.startsWith('file:')) {
-    int libIndex = filename.lastIndexOf('lib/');
-    if (libIndex != -1) {
-      return filename.substring(libIndex + 'lib/'.length);
-    }
-  }
-  return filename;
-}
-
-main(List<String> args) {
-  if (args.length != 2) {
-    print(usage);
-    exit(1);
-  }
-  List<String> stackTrace = new File(args[1]).readAsLinesSync();
-  Program program = loadProgramFromBinary(args[0]);
-  TreeShaker shaker = new TreeShaker(program);
-  Set<String> reachablePatterns = new Set<String>();
-  Set<String> allMembers = new Set<String>();
-  Set<String> instantiatedClasses = new Set<String>();
-  void visitMember(Member member) {
-    allMembers.add(stackTraceName(member));
-    if (shaker.isMemberUsed(member)) {
-      reachablePatterns.add(stackTraceName(member));
-    }
-  }
-  for (var library in program.libraries) {
-    for (var classNode in library.classes) {
-      if (shaker.isInstantiated(classNode)) {
-        instantiatedClasses.add(classNode.name);
-      }
-      classNode.members.forEach(visitMember);
-    }
-    library.members.forEach(visitMember);
-  }
-  for (String line in stackTrace) {
-    var match = stackTraceEntry.matchAsPrefix(line);
-    if (match == null) continue;
-    String entry = match.group(2);
-    int reachableIndex = findReachablePrefix(entry, reachablePatterns);
-    int knownIndex = findReachablePrefix(entry, allMembers);
-    int classIndex = findReachablePrefix(entry, instantiatedClasses);
-    if (reachableIndex == 0) {
-      reachableIndex = classIndex;
-      if (reachableIndex > knownIndex) {
-        knownIndex = reachableIndex;
-      }
-    }
-    String numberPart = match.group(1);
-    String reachablePart = reachable(entry.substring(0, reachableIndex));
-    String knownPart = unreachable(entry.substring(reachableIndex, knownIndex));
-    String unknownPart = unknown(entry.substring(knownIndex));
-    String filePart = filecolor(shortenFilename(match.group(3)));
-    String string = '$numberPart$reachablePart$knownPart$unknownPart';
-    print(string.padRight(110) + filePart);
-  }
-  print(legend);
-}