Use pub_semver package in pub.

sdk/lib/_internal/pub_generated/lib/src/solver/solve_report.dart

 library pub.solver.solve_report;
+import 'package:pub_semver/pub_semver.dart';
 import '../lock_file.dart';
 import '../log.dart' as log;
 import '../package.dart';
 import '../source_registry.dart';
 import '../utils.dart';
-import '../version.dart';
 import 'version_solver.dart';
 class SolveReport {
   final SolveType _type;
   final SourceRegistry _sources;
   final Package _root;
   final LockFile _previousLockFile;
   final SolveResult _result;
   final _dependencies = new Map<String, PackageId>();
   final _output = new StringBuffer();
   SolveReport(this._type, this._sources, this._root, this._previousLockFile,
@@ skipping 136 matching lines @@
   }
   void _writeId(PackageId id) {
     _output.write(id.version);
     var source = _sources[id.source];
     if (source != _sources.defaultSource) {
       var description = source.formatDescription(_root.dir, id.description);
       _output.write(" from ${id.source} $description");
     }
   }
 }