Issue 29288. Resynthesize Import/Export/PartElement for every directive.

pkg/analyzer/lib/src/generated/declaration_resolver.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 analyzer.src.generated.declaration_resolver;
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/ast/token.dart';
 import 'package:analyzer/dart/ast/visitor.dart';
 import 'package:analyzer/dart/element/element.dart';
@@ skipping 142 matching lines @@
       }
       super.visitEnumDeclaration(node);
     });
     _resolveMetadata(node, node.metadata, element);
     return null;
   }
 
   @override
   Object visitExportDirective(ExportDirective node) {
     super.visitExportDirective(node);
+//    var element = node.element as ExportElement;
+//    List<ElementAnnotation> annotations = element.metadata;

[Brian Wilkerson, 2017/04/09 16:01:24]

Should we remove these line? (in all three places)

     List<ElementAnnotation> annotations =
         _enclosingUnit.getAnnotations(node.offset);
     if (annotations.isEmpty && node.metadata.isNotEmpty) {
       int index = (node.parent as CompilationUnit)
           .directives
           .where((directive) => directive is ExportDirective)
           .toList()
           .indexOf(node);
       annotations = _walker.element.library.exports[index].metadata;
     }
@@ skipping 120 matching lines @@
     _walk(new ElementWalker.forGenericTypeAlias(element), () {
       super.visitGenericTypeAlias(node);
     });
     _resolveMetadata(node, node.metadata, element);
     return null;
   }
 
   @override
   Object visitImportDirective(ImportDirective node) {
     super.visitImportDirective(node);
+//    var element = node.element as ImportElement;
+//    List<ElementAnnotation> annotations = element.metadata;
     List<ElementAnnotation> annotations =
         _enclosingUnit.getAnnotations(node.offset);
     if (annotations.isEmpty && node.metadata.isNotEmpty) {
       int index = (node.parent as CompilationUnit)
           .directives
           .where((directive) => directive is ImportDirective)
           .toList()
           .indexOf(node);
       annotations = _walker.element.library.imports[index].metadata;
     }
@@ skipping 47 matching lines @@
     _walk(new ElementWalker.forExecutable(element, _enclosingUnit), () {
       super.visitMethodDeclaration(node);
     });
     _resolveMetadata(node, node.metadata, element);
     return null;
   }
 
   @override
   Object visitPartDirective(PartDirective node) {
     super.visitPartDirective(node);
+//    var element = node.element as CompilationUnitElement;
+//    List<ElementAnnotation> annotations = element.metadata;
     List<ElementAnnotation> annotations =
         _enclosingUnit.getAnnotations(node.offset);
     if (annotations.isEmpty && node.metadata.isNotEmpty) {
       int index = (node.parent as CompilationUnit)
           .directives
           .where((directive) => directive is PartDirective)
           .toList()
           .indexOf(node);
       annotations = _walker.element.library.parts[index].metadata;
     }
@@ skipping 402 matching lines @@
 class _ElementMismatchException extends AnalysisException {
   /**
    * Creates an exception to refer to the given [compilationUnit], [element],
    * and [cause].
    */
   _ElementMismatchException(
       CompilationUnitElement compilationUnit, Element element,
       [CaughtException cause = null])
       : super('Element mismatch in $compilationUnit at $element', cause);
 }