Don't resynthesize field types during class members resynthesis.

pkg/analyzer/test/src/summary/summary_common.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.
 
 library analyzer.test.src.summary.summary_common;
 
 import 'package:analyzer/analyzer.dart';
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/error/listener.dart';
 import 'package:analyzer/src/dart/scanner/reader.dart';
@@ skipping 9536 matching lines @@
     String text = 'f(g(p)) {}';
     UnlinkedExecutable f = serializeExecutableText(text);
     UnlinkedParam g = f.parameters[0];
     UnlinkedParam p = g.parameters[0];
     expect(g.name, 'g');
     expect(p.name, 'p');
     _assertParameterVisible(text, g, '{', '}');
     _assertParameterZeroVisibleRange(p);
   }
 
+  test_parameter_visibleRange_invalid_fieldFormalParameter() {
+    UnlinkedExecutable m =
+        findExecutable('m', executables: serializeClassText(r'''
+class C {
+  int foo;
+  void m(this.foo) {}
+}
+''').executables);
+    _assertParameterZeroVisibleRange(m.parameters[0]);
+  }
+
   test_parameter_visibleRange_typedef() {
     UnlinkedTypedef type = serializeTypedefText('typedef F(x);');
     _assertParameterZeroVisibleRange(type.parameters[0]);
   }
 
   test_part_declaration() {
     addNamedSource('/a.dart', 'part of my.lib;');
     String text = 'library my.lib; part "a.dart"; // <-part';
     serializeLibraryText(text);
     expect(unlinkedUnits[0].publicNamespace.parts, hasLength(1));
@@ skipping 1130 matching lines @@
 class _PrefixExpectation {
   final ReferenceKind kind;
   final String name;
   final String absoluteUri;
   final String relativeUri;
   final int numTypeParameters;
 
   _PrefixExpectation(this.kind, this.name,
       {this.absoluteUri, this.relativeUri, this.numTypeParameters: 0});
 }