Included setters in testing of the void => return-any-type feature.

tests/compiler/dart2js/type_checker_test.dart

Index: tests/compiler/dart2js/type_checker_test.dart
diff --git a/tests/compiler/dart2js/type_checker_test.dart b/tests/compiler/dart2js/type_checker_test.dart
index 0173d8d238286af875c2bc5131cceff43e432258..8ef5f3745accac23e69e22d693c325d72897c047 100644
--- a/tests/compiler/dart2js/type_checker_test.dart
+++ b/tests/compiler/dart2js/type_checker_test.dart
@@ -100,6 +100,8 @@ Future testReturn(MockCompiler compiler) {
     check(returnWithType("void", 1), MessageKind.RETURN_VALUE_IN_VOID),
     check(returnWithType("void", null)),
     check(returnWithType("String", ""), MessageKind.RETURN_NOTHING),
+    check(arrowReturnWithType("void", "4")),
+    check("void set foo(x) => 5;"),
     // check("String foo() {};"), // Should probably fail.
   ]);
 }
@@ -2615,6 +2617,10 @@ String returnWithType(String type, expression) {
   return "$type foo() { return $expression; }";
 }
 
+String arrowReturnWithType(String type, expression) {
+  return "$type foo() => $expression;";
+}
+
 Node parseExpression(String text) =>
     parseBodyCode(text, (parser, token) => parser.parseExpression(token));