Issue 30179. Infer return type of static setters to 'void'.

pkg/front_end/testcases/inference/infer_return_type_for_static_setter.dart

Index: pkg/front_end/testcases/inference/infer_return_type_for_static_setter.dart
diff --git a/pkg/front_end/testcases/inference/infer_return_type_for_static_setter.dart b/pkg/front_end/testcases/inference/infer_return_type_for_static_setter.dart
new file mode 100644
index 0000000000000000000000000000000000000000..e3bf1427e60067e5dc254b245f08820ccd96c5f0
--- /dev/null
+++ b/pkg/front_end/testcases/inference/infer_return_type_for_static_setter.dart
@@ -0,0 +1,14 @@
+// Copyright (c) 2017, 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.
+
+/*@testedFeatures=inference*/
+library test;
+
+class C {
+  static set /*@topType=void*/ foo(int x) {}
+}
+
+set /*@topType=void*/ bar(int x) {}
+
+main() {}