Store actual Reference(s) for additional exports.

pkg/kernel/lib/text/ast_to_text.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_to_text;
 
 import '../ast.dart';
 import '../import_table.dart';
 
 class Namer<T> {
   int index = 0;
@@ skipping 265 matching lines @@
       var importPath = imports.getImportPath(library);
       if (importPath == "") {
         var prefix =
             syntheticNames.nameLibraryPrefix(library, proposedName: 'self');
         endLine('import self as $prefix;');
       } else {
         var prefix = syntheticNames.nameLibraryPrefix(library);
         endLine('import "$importPath" as $prefix;');
       }
     }
+
     // TODO(scheglov): Do we want to print dependencies? dartbug.com/30224
+    if (library.additionalExports.isNotEmpty) {
+      write('additionalExports = (');
+      if (library.additionalExports.length > 5) {
+        write('too many items');

[ahe, 2017/08/29 11:04:23]

I don't think we should truncate the output.

[scheglov, 2017/08/29 15:16:26]

Done.

+      } else {
+        for (var reference in library.additionalExports) {
+          var node = reference.node;
+          if (node is Class) {
+            Library nodeLibrary = node.enclosingLibrary;
+            String prefix = syntheticNames.nameLibraryPrefix(nodeLibrary);
+            write(prefix + '::' + node.name);
+          } else if (node is Field) {
+            Library nodeLibrary = node.enclosingLibrary;
+            String prefix = syntheticNames.nameLibraryPrefix(nodeLibrary);
+            write(prefix + '::' + node.name.name);
+          } else if (node is Procedure) {
+            Library nodeLibrary = node.enclosingLibrary;
+            String prefix = syntheticNames.nameLibraryPrefix(nodeLibrary);
+            write(prefix + '::' + node.name.name);
+          } else if (node is Typedef) {
+            Library nodeLibrary = node.enclosingLibrary;
+            String prefix = syntheticNames.nameLibraryPrefix(nodeLibrary);
+            write(prefix + '::' + node.name);
+          } else {
+            throw new UnimplementedError('${node.runtimeType}');
+          }
+        }
+      }
+      endLine(')');
+    }
+
     endLine();
     var inner = new Printer._inner(this, imports);
     library.typedefs.forEach(inner.writeNode);
     library.classes.forEach(inner.writeNode);
     library.fields.forEach(inner.writeNode);
     library.procedures.forEach(inner.writeNode);
   }
 
   void writeProgramFile(Program program) {
     ImportTable imports = new ProgramImportTable(program);
@@ skipping 1375 matching lines @@
   }
   throw 'illegal ProcedureKind: $kind';
 }
 
 class ExpressionPrinter {
   final Printer writeer;
   final int minimumPrecedence;
 
   ExpressionPrinter(this.writeer, this.minimumPrecedence);
 }