Dart SDK Spelling b, c, and d.

pkg/kernel/lib/transformations/treeshaker.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.tree_shaker;
 
 import '../ast.dart';
 import '../class_hierarchy.dart';
 import '../core_types.dart';
 import '../type_environment.dart';
@@ skipping 428 matching lines @@
     }
     visitList(classNode.annotations, _visitor);
   }
 
   /// Registers the given root as being used.
   void _addUsedRoot(ProgramRoot root, LibraryIndex table) {
     if (root.kind == ProgramRootKind.ExternallyInstantiatedClass) {
       Class class_ = root.getClass(table);
 
       // This is a class which will be instantiated by non-Dart code (whether it
-      // has a valid generative construtor or not).
+      // has a valid generative constructor or not).
       _addInstantiatedClass(class_);
 
       // We keep all the constructors of externally instantiated classes.
       // Sometimes the runtime might do a constructor call and sometimes it
       // might just allocate the class without invoking the constructor.
       // So we try to be on the safe side here!
       for (var constructor in class_.constructors) {
         _addUsedMember(class_, constructor);
       }
 
@@ skipping 618 matching lines @@
         classNode == coreTypes.futureClass ||
         classNode == coreTypes.streamClass ||
         classNode == coreTypes.listClass ||
         classNode == coreTypes.mapClass;
   }
 }
 
 /// Exception that is thrown to stop the tree shaking analysis when a use
 /// of `dart:mirrors` is found.
 class _UsingMirrorsException {}