Implement type inference for type literals

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 1963 matching lines @@
   KernelTypeLiteral(DartType type) : super(type);
 
   @override
   void _collectDependencies(KernelDependencyCollector collector) {
     // No inference dependencies.
   }
 
   @override
   DartType _inferExpression(
       KernelTypeInferrer inferrer, DartType typeContext, bool typeNeeded) {
-    // TODO(scheglov): implement.
-    return typeNeeded ? const DynamicType() : null;
+    return typeNeeded ? inferrer.coreTypes.typeClass.rawType : null;
   }
 }
 
 /// Concrete implementation of [TypePromoter] specialized to work with kernel
 /// objects.
 class KernelTypePromoter extends TypePromoterImpl {
   @override
   int getVariableFunctionNestingLevel(VariableDeclaration variable) {
     if (variable is KernelVariableDeclaration) {
       return variable._functionNestingLevel;
@@ skipping 220 matching lines @@
   }
 
   transformChildren(v) {
     return internalError("Internal error: Unsupported operation.");
   }
 
   visitChildren(v) {
     return internalError("Internal error: Unsupported operation.");
   }
 }