Use correct types on cloned constructors in mixin applications.

pkg/front_end/lib/src/fasta/kernel/body_builder.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 fasta.body_builder;
 
 import '../parser/parser.dart' show FormalParameterType, optional;
 
 import '../parser/error_kind.dart' show ErrorKind;
 
@@ skipping 151 matching lines @@
 
   Expression popForEffect() => toEffect(pop());
 
   Expression popForValueIfNotNull(Object value) {
     return value == null ? null : popForValue();
   }
 
   @override
   Expression toValue(Object node) {
     if (node is UnresolvedIdentifier) {
+      if (isDartLibrary &&
+          node.name.name == "main" &&
+          library.uri.path == "_builtin" &&
+          member?.name == "_getMainClosure") {
+        // TODO(ahe): https://github.com/dart-lang/sdk/issues/28989
+        return new NullLiteral()..fileOffset = node.fileOffset;
+      }
       return throwNoSuchMethodError(
           node.name.name, new Arguments.empty(), node.fileOffset,
           isGetter: true);
     } else if (node is BuilderAccessor) {
       return node.buildSimpleRead();
     } else if (node is TypeVariableBuilder) {
       TypeParameterType type = node.buildTypesWithBuiltArguments(library, null);
       if (!isInstanceContext && type.parameter.parent is Class) {
         return buildCompileTimeError(
             "Type variables can only be used in instance methods.");
@@ skipping 2513 matching lines @@
   } else if (node is TypeDeclarationBuilder) {
     return node.name;
   } else if (node is PrefixBuilder) {
     return node.name;
   } else if (node is ThisPropertyAccessor) {
     return node.name.name;
   } else {
     return internalError("Unhandled: ${node.runtimeType}");
   }
 }