copy TypeName.type when we clone the AST

lib/src/compiler/reify_coercions.dart

 // Copyright (c) 2015, 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.
 
 import 'package:analyzer/analyzer.dart' as analyzer;
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/dart/element/type.dart' show DartType;
 import 'package:analyzer/src/dart/ast/ast.dart' show FunctionBodyImpl;
 import 'package:analyzer/src/dart/ast/utilities.dart' show NodeReplacer;
 import 'package:analyzer/src/dart/element/type.dart' show DynamicTypeImpl;
@@ skipping 145 matching lines @@
   }
 
   @override
   ExpressionFunctionBody visitExpressionFunctionBody(
       ExpressionFunctionBody node) {
     var clone = super.visitExpressionFunctionBody(node);
     (clone as FunctionBodyImpl).localVariableInfo =
         (node as FunctionBodyImpl).localVariableInfo;
     return clone;
   }
+
+  // TODO(jmesserly): workaround for
+  // https://github.com/dart-lang/sdk/issues/26368
+  @override
+  TypeName visitTypeName(TypeName node) {
+    var clone = super.visitTypeName(node);
+    clone.type = node.type;
+    return clone;
+  }
 }