When target requires a function, propose a function reference, not an invocation

pkg/analysis_server/lib/src/services/completion/local_computer.dart

 // Copyright (c) 2014, 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 services.completion.computer.dart.local;
 
 import 'dart:async';
 
 import 'package:analysis_server/src/protocol.dart' as protocol
     show Element, ElementKind;
@@ skipping 86 matching lines @@
         optype.includeCaseLabelSuggestions) {
       _LabelVisitor labelVisitor = new _LabelVisitor(request,
           optype.includeStatementLabelSuggestions,
           optype.includeCaseLabelSuggestions);
       labelVisitor.visit(request.node);
     }
     if (optype.includeConstructorSuggestions) {
       new _ConstructorVisitor(request).visit(request.node);
     }
 
-    // If the unit is not a part and does not reference any parts
-    // then work is complete
-    return !request.unit.directives.any((Directive directive) =>
-        directive is PartOfDirective || directive is PartDirective);
+    // If target is an argument in an argument list
+    // then suggestions may need to be adjusted
+    return request.target.argIndex == null;
   }
 
   @override
   Future<bool> computeFull(DartCompletionRequest request) {
-    // TODO: implement computeFull
-    // include results from part files that are included in the library
+    _updateSuggestions(request);
     return new Future.value(false);
   }
+
+  /**
+   * If target is a function argument, suggest identifiers not invocations
+   */
+  void _updateSuggestions(DartCompletionRequest request) {
+    if (request.target.isFunctionalArgument()) {
+      request.convertInvocationsToIdentifiers();
+    }
+  }
 }
 
 /**
  * A visitor for collecting constructor suggestions.
  */
 class _ConstructorVisitor extends LocalDeclarationVisitor {
   final DartCompletionRequest request;
 
   _ConstructorVisitor(DartCompletionRequest request)
       : super(request.offset),
@@ skipping 553 matching lines @@
   bool _isVoid(TypeName returnType) {
     if (returnType != null) {
       Identifier id = returnType.name;
       if (id != null && id.name == 'void') {
         return true;
       }
     }
     return false;
   }
 }