Add local type inference logic for integer 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`.
 ///
 /// Note that these classes represent the Dart language prior to desugaring.
 /// When a single Dart construct desugars to a tree containing multiple kernel
 /// AST nodes, the shadow class extends the kernel object at the top of the
 /// desugared tree.
 ///
 /// This means that in some cases multiple shadow classes may extend the same
 /// kernel class, because multiple constructs in Dart may desugar to a tree
 /// with the same kind of root node.
 import 'package:front_end/src/base/instrumentation.dart';
 import 'package:front_end/src/fasta/type_inference/type_inferrer.dart';
 import 'package:kernel/ast.dart';
 import 'package:kernel/class_hierarchy.dart';
 import 'package:kernel/core_types.dart';
 
 /// Concrete shadow object representing a statement block in kernel form.
 class KernelBlock extends Block implements KernelStatement {
-  KernelBlock(List<KernelStatement> statements) : super(statements);
+  KernelBlock(List<Statement> statements) : super(statements);
 
   @override
   void _inferStatement(KernelTypeInferrer inferrer) {
-    // TODO(paulberry): implement.
+    for (var statement in statements) {
+      inferrer.inferStatement(statement);
+    }
   }
 }
 
 /// Common base class for shadow objects representing expressions in kernel
 /// form.
 abstract class KernelExpression implements Expression {
   /// Calls back to [inferrer] to perform type inference for whatever concrete
   /// type of [KernelExpression] this is.
   DartType _inferExpression(
       KernelTypeInferrer inferrer, DartType typeContext, bool typeNeeded);
@@ skipping 12 matching lines @@
   }
 }
 
 /// Concrete shadow object representing an integer literal in kernel form.
 class KernelIntLiteral extends IntLiteral implements KernelExpression {
   KernelIntLiteral(int value) : super(value);
 
   @override
   DartType _inferExpression(
       KernelTypeInferrer inferrer, DartType typeContext, bool typeNeeded) {
-    // TODO(paulberry): implement.
-    return typeNeeded ? const DynamicType() : null;
+    return inferrer.inferIntLiteral(typeContext, typeNeeded);
   }
 }
 
 /// Concrete shadow object representing a list literal in kernel form.
 class KernelListLiteral extends ListLiteral implements KernelExpression {
   KernelListLiteral(List<KernelExpression> expressions,
       {DartType typeArgument, bool isConst: false})
       : super(expressions, typeArgument: typeArgument, isConst: isConst);
 
   @override
@@ skipping 73 matching lines @@
       // implemented, so just skip it for now.
       // TODO(paulberry): once the BodyBuilder uses shadow classes for
       // everything, this case should no longer be needed.
     }
   }
 }
 
 /// Concrete shadow object representing a variable declaration in kernel form.
 class KernelVariableDeclaration extends VariableDeclaration
     implements KernelStatement {
+  final bool _implicitlyTyped;
+
   KernelVariableDeclaration(String name,
-      {KernelExpression initializer,
+      {Expression initializer,
       DartType type,
       bool isFinal: false,
       bool isConst: false})
-      : super(name,
+      : _implicitlyTyped = type == null,
+        super(name,
             initializer: initializer,
-            type: type,
+            type: type ?? const DynamicType(),
             isFinal: isFinal,
             isConst: isConst);
 
   @override
   void _inferStatement(KernelTypeInferrer inferrer) {
-    // TODO(paulberry): implement.
+    inferrer.inferVariableDeclaration(
+        _implicitlyTyped ? null : type, initializer, fileOffset, (type) {
+      this.type = type;
+    });
   }
 }
 
 /// Concrete shadow object representing a read from a variable in kernel form.
 class KernelVariableGet extends VariableGet implements KernelExpression {
   KernelVariableGet(VariableDeclaration variable, [DartType promotedType])
       : super(variable, promotedType);
 
   @override
   DartType _inferExpression(
       KernelTypeInferrer inferrer, DartType typeContext, bool typeNeeded) {
     // TODO(paulberry): implement.
     return typeNeeded ? const DynamicType() : null;
   }
 }