Store parts in Kernel Library, resynthesize parts in Analyzer.

pkg/kernel/lib/visitor.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 kernel.ast.visitor;
 
 import 'ast.dart';
 
 abstract class ExpressionVisitor<R> {
   R defaultExpression(Expression node) => null;
   R defaultBasicLiteral(BasicLiteral node) => defaultExpression(node);
@@ skipping 204 matching lines @@
   R visitFieldInitializer(FieldInitializer node) => defaultInitializer(node);
   R visitSuperInitializer(SuperInitializer node) => defaultInitializer(node);
   R visitRedirectingInitializer(RedirectingInitializer node) =>
       defaultInitializer(node);
   R visitLocalInitializer(LocalInitializer node) => defaultInitializer(node);
 
   // Other tree nodes
   R visitLibrary(Library node) => defaultTreeNode(node);
   R visitLibraryDependency(LibraryDependency node) => defaultTreeNode(node);
   R visitCombinator(Combinator node) => defaultTreeNode(node);
+  R visitLibraryPart(LibraryPart node) => defaultTreeNode(node);
   R visitTypedef(Typedef node) => defaultTreeNode(node);
   R visitTypeParameter(TypeParameter node) => defaultTreeNode(node);
   R visitFunctionNode(FunctionNode node) => defaultTreeNode(node);
   R visitArguments(Arguments node) => defaultTreeNode(node);
   R visitNamedExpression(NamedExpression node) => defaultTreeNode(node);
   R visitSwitchCase(SwitchCase node) => defaultTreeNode(node);
   R visitCatch(Catch node) => defaultTreeNode(node);
   R visitMapEntry(MapEntry node) => defaultTreeNode(node);
   R visitProgram(Program node) => defaultTreeNode(node);
 }
@@ skipping 201 matching lines @@
       defaultStatement(node, arg);
   R visitTryCatch(TryCatch node, T arg) => defaultStatement(node, arg);
   R visitTryFinally(TryFinally node, T arg) => defaultStatement(node, arg);
   R visitYieldStatement(YieldStatement node, T arg) =>
       defaultStatement(node, arg);
   R visitVariableDeclaration(VariableDeclaration node, T arg) =>
       defaultStatement(node, arg);
   R visitFunctionDeclaration(FunctionDeclaration node, T arg) =>
       defaultStatement(node, arg);
 }