Fixes for referenced names computing.

pkg/analyzer/test/src/dart/analysis/referenced_names_test.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.
 
 import 'package:analyzer/dart/ast/ast.dart';
 import 'package:analyzer/src/dart/analysis/referenced_names.dart';
 import 'package:test/test.dart';
 import 'package:test_reflective_loader/test_reflective_loader.dart';
 
 import '../../../generated/parser_test.dart';
@@ skipping 10 matching lines @@
     Set<String> names = _computeReferencedNames('''
 class U {
   U.named(A a, B b) {
     C c = null;
   }
 }
 ''');
     expect(names, unorderedEquals(['A', 'B', 'C']));
   }
 
+  test_class_constructor_parameters() {
+    Set<String> names = _computeReferencedNames('''
+class U {
+  U(A a) {
+    a;
+    b;
+  }
+}
+''');
+    expect(names, unorderedEquals(['A', 'b']));
+  }
+
   test_class_field() {
     Set<String> names = _computeReferencedNames('''
 class U {
   A f = new B();
 }
 ''');
     expect(names, unorderedEquals(['A', 'B']));
   }
 
   test_class_getter() {
@@ skipping 72 matching lines @@
 class U {
   m(A a) {
     a;
     b;
   }
 }
 ''');
     expect(names, unorderedEquals(['A', 'b']));
   }
 
+  test_class_method_parameters_dontHideNamedExpressionName() {
+    Set<String> names = _computeReferencedNames('''
+main() {
+  var p;
+  new C(p: p);
+}
+''');
+    expect(names, unorderedEquals(['C', 'p']));
+  }
+
   test_class_method_typeParameters() {
     Set<String> names = _computeReferencedNames('''
 class U {
   A m<T>(B b, T t) {
     C c = 0;
   }
 }
 ''');
     expect(names, unorderedEquals(['A', 'B', 'C']));
   }
@@ skipping 247 matching lines @@
 }
 ''');
     expect(names, unorderedEquals(['A', 'B', 'C']));
   }
 
   Set<String> _computeReferencedNames(String code) {
     CompilationUnit unit = parseCompilationUnit2(code);
     return computeReferencedNames(unit);
   }
 }