Optimize splitting long, complex lines.

benchmark/after.dart.txt

 // Copyright (c) 2012, 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.solver.backtracking_solver;
 
 import 'dart:async';
 import 'dart:collection' show Queue;
 
 import '../barback.dart' as barback;
@@ skipping 627 matching lines @@
   /// descriptions, not the version.
   void _validateDependency(Dependency dependency) {
     var dep = dependency.dep;
 
     // Make sure the dependencies agree on source and description.
     var required = _getRequired(dep.name);
     if (required == null) return;
 
     // Make sure all of the existing sources match the new reference.
     if (required.dep.source != dep.source) {
-      _solver.logSolve(
-          'source mismatch on ${dep.name}: ${required.dep.source} ' '!= ${dep.source}');
+      _solver.logSolve('source mismatch on ${dep.name}: ${required.dep.source} '
+          '!= ${dep.source}');
       throw new SourceMismatchException(dep.name, [required, dependency]);
     }
 
     // Make sure all of the existing descriptions match the new reference.
     var source = _solver.sources[dep.source];
     if (!source.descriptionsEqual(dep.description, required.dep.description)) {
       _solver.logSolve('description mismatch on ${dep.name}: '
           '${required.dep.description} != ${dep.description}');
       throw new DescriptionMismatchException(dep.name, [required, dependency]);
     }
@@ skipping 146 matching lines @@
 /// Ensures that if [pubspec] has an SDK constraint, then it is compatible
 /// with the current SDK.
 ///
 /// Throws a [SolveFailure] if not.
 void _validateSdkConstraint(Pubspec pubspec) {
   if (pubspec.environment.sdkVersion.allows(sdk.version)) return;
 
   throw new BadSdkVersionException(
       pubspec.name,
       'Package ${pubspec.name} requires SDK version '
-      '${pubspec.environment.sdkVersion} but the current SDK is ' '${sdk.version}.');
+      '${pubspec.environment.sdkVersion} but the current SDK is '
+      '${sdk.version}.');
 }