Issue 23545. Replace unaccessible type parameters with 'dynamic'.

pkg/analysis_server/lib/src/services/correction/util.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.src.correction.util;
 
 import 'dart:math';
 
 import 'package:analysis_server/src/protocol.dart'
     show SourceChange, SourceEdit;
@@ skipping 1012 matching lines @@
   }
 
   /**
    * Returns the source to reference [type] in this [CompilationUnit].
    *
    * Fills [librariesToImport] with [LibraryElement]s whose elements are
    * used by the generated source, but not imported.
    */
   String getTypeSource(DartType type, Set<LibraryElement> librariesToImport) {
     StringBuffer sb = new StringBuffer();
+    // type parameter
+    if (!_isTypeVisible(type)) {
+      return 'dynamic';
+    }
     // just a Function, not FunctionTypeAliasElement
     if (type is FunctionType && type.element is! FunctionTypeAliasElement) {
       return "Function";
     }
     // BottomType
     if (type.isBottom) {
       return 'dynamic';
     }
     // prepare element
     Element element = type.element;
@@ skipping 515 matching lines @@
 
   @override
   Object visitExpression(Expression node) {
     if (node is BinaryExpression && node.operator.type == groupOperatorType) {
       return super.visitNode(node);
     }
     operands.add(node);
     return null;
   }
 }