Infer types of bool/null/string literals.

pkg/front_end/lib/src/fasta/kernel/kernel_ast_factory.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.
 
 import 'package:front_end/src/fasta/kernel/utils.dart';
 import 'package:front_end/src/fasta/scanner/token.dart' show Token;
 import 'package:front_end/src/fasta/type_inference/type_promotion.dart';
 import 'package:kernel/ast.dart';
 
 import '../builder/ast_factory.dart';
 import 'kernel_shadow_ast.dart';
 
 /// Concrete implementation of [builder.AstFactory] for building a kernel AST.
 class KernelAstFactory implements AstFactory<VariableDeclaration> {
   @override
   KernelBlock block(List<Statement> statements, Token beginToken) {
     return new KernelBlock(statements)..fileOffset = offsetForToken(beginToken);
   }
 
   @override
+  KernelBoolLiteral boolLiteral(bool value, Token token) {
+    return new KernelBoolLiteral(value)..fileOffset = offsetForToken(token);
+  }
+
+  @override
   KernelDoubleLiteral doubleLiteral(double value, Token token) {
     return new KernelDoubleLiteral(value)..fileOffset = offsetForToken(token);
   }
 
   @override
   ExpressionStatement expressionStatement(Expression expression) {
     return new KernelExpressionStatement(expression);
   }
 
   @override
@@ skipping 42 matching lines @@
     return new KernelReturnStatement(expression)
       ..fileOffset = offsetForToken(token);
   }
 
   @override
   StaticGet staticGet(Member readTarget, Token token) {
     return new KernelStaticGet(readTarget)..fileOffset = offsetForToken(token);
   }
 
   @override
+  StringConcatenation stringConcatenation(
+      List<Expression> expressions, Token token) {
+    return new KernelStringConcatenation(expressions)
+      ..fileOffset = offsetForToken(token);
+  }
+
+  @override
+  StringLiteral stringLiteral(String value, Token token) {
+    return new KernelStringLiteral(value)..fileOffset = offsetForToken(token);
+  }
+
+  @override
   VariableDeclaration variableDeclaration(
       String name, Token token, int functionNestingLevel,
       {DartType type,
       Expression initializer,
       Token equalsToken,
       bool isFinal: false,
       bool isConst: false}) {
     return new KernelVariableDeclaration(name, functionNestingLevel,
         type: type,
         initializer: initializer,
         isFinal: isFinal,
         isConst: isConst)
       ..fileOffset = offsetForToken(token)
       ..fileEqualsOffset = offsetForToken(equalsToken);
   }
 
   @override
   VariableGet variableGet(
       VariableDeclaration variable,
       TypePromotionFact<VariableDeclaration> fact,
       TypePromotionScope scope,
       Token token) {
     return new KernelVariableGet(variable, fact, scope)
       ..fileOffset = offsetForToken(token);
   }
 }