Don't type promote local functions.

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 '../fasta_codes.dart'
     show FastaMessage, codeExpectedButGot, codeExpectedFunctionBody;
 
 import '../parser/parser.dart' show FormalParameterType, optional;
 
 import '../parser/identifier_context.dart' show IdentifierContext;
 
 import 'package:front_end/src/fasta/builder/ast_factory.dart' show AstFactory;
 
 import 'package:front_end/src/fasta/kernel/kernel_shadow_ast.dart'
-    show KernelArguments, KernelField;
+    show KernelArguments, KernelField, KernelFunctionDeclaration;
 
 import 'package:front_end/src/fasta/kernel/utils.dart' show offsetForToken;
 
 import 'package:front_end/src/fasta/type_inference/type_inference_engine.dart'
     show FieldNode;
 
 import 'package:front_end/src/fasta/type_inference/type_inferrer.dart'
     show TypeInferrer;
 
 import 'package:front_end/src/fasta/type_inference/type_promotion.dart'
@@ skipping 2007 matching lines @@
     Identifier identifier = pop();
     push(new NamedExpression(identifier.name, value));
   }
 
   @override
   void endFunctionName(Token beginToken, Token token) {
     debugEvent("FunctionName");
     Identifier name = pop();
     VariableDeclaration variable = astFactory.variableDeclaration(
         name.name, name.token, functionNestingLevel,
-        isFinal: true);
-    push(new FunctionDeclaration(
+        isFinal: true, isLocalFunction: true);
+    push(new KernelFunctionDeclaration(
         variable, new FunctionNode(new InvalidStatement()))
       ..fileOffset = beginToken.charOffset);
     scope[variable.name] = new KernelVariableBuilder(
         variable, member ?? classBuilder ?? library, uri);
     enterLocalScope();
   }
 
   void enterFunction() {
     debugEvent("enterFunction");
     functionNestingLevel++;
@@ skipping 38 matching lines @@
       ..fileEndOffset = endToken.charOffset));
   }
 
   @override
   void endFunctionDeclaration(Token token) {
     debugEvent("FunctionDeclaration");
     FunctionNode function = pop();
     exitLocalScope();
     FunctionDeclaration declaration = pop();
     function.returnType = pop() ?? const DynamicType();
+    declaration.variable.type = function.functionType;
     pop(); // Modifiers.
     exitFunction();
     declaration.function = function;
     function.parent = declaration;
     push(declaration);
   }
 
   @override
   void endUnnamedFunction(Token beginToken, Token token) {
     debugEvent("UnnamedFunction");
@@ skipping 1016 matching lines @@
   } else if (node is PrefixBuilder) {
     return node.name;
   } else if (node is ThisAccessor) {
     return node.isSuper ? "super" : "this";
   } else if (node is FastaAccessor) {
     return node.plainNameForRead;
   } else {
     return internalError("Unhandled: ${node.runtimeType}");
   }
 }