Implement type variables on local function declarations and expressions.

pkg/front_end/lib/src/fasta/kernel/kernel_shadow_ast.dart

 // Copyright (c) 2017, 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.
 
 /// This file declares a "shadow hierarchy" of concrete classes which extend
 /// the kernel class hierarchy, adding methods and fields needed by the
 /// BodyBuilder.
 ///
 /// Instances of these classes may be created using the factory methods in
 /// `ast_factory.dart`.
@@ skipping 1339 matching lines @@
 /// Concrete shadow object representing a named function expression.
 ///
 /// Named function expressions are not legal in Dart, but they are accepted by
 /// the parser and BodyBuilder for error recovery purposes.
 ///
 /// A named function expression of the form `f() { ... }` is represented as the
 /// kernel expression:
 ///
 ///     let f = () { ... } in f
 class KernelNamedFunctionExpression extends Let implements KernelExpression {
-  KernelNamedFunctionExpression(VariableDeclaration variable, Expression body)
-      : super(variable, body);
+  KernelNamedFunctionExpression(VariableDeclaration variable)
+      : super(variable, new VariableGet(variable));
 
   @override
   void _collectDependencies(KernelDependencyCollector collector) {
     collector.collectDependencies(variable.initializer);
   }
 
   @override
   DartType _inferExpression(
       KernelTypeInferrer inferrer, DartType typeContext, bool typeNeeded) {
     typeNeeded =
@@ skipping 1135 matching lines @@
   accept(v) => unsupported("accept", -1, null);
 
   accept1(v, arg) => unsupported("accept1", -1, null);
 
   getStaticType(types) => unsupported("getStaticType", -1, null);
 
   transformChildren(v) => unsupported("transformChildren", -1, null);
 
   visitChildren(v) => unsupported("visitChildren", -1, null);
 }