Allow anonymous memberless Struct

Previously, named memberless Structs were allowed, but anonymous
memberless Structs were not.

Fixes [Bug #19416]

1 files changed, 14 insertions, 0 deletions

diff --git a/spec/ruby/core/struct/new_spec.rb b/spec/ruby/core/struct/new_spec.rb
index 7b4a4f7980..4aeaa066e1 100644
--- a/spec/ruby/core/struct/new_spec.rb
+++ b/spec/ruby/core/struct/new_spec.rb
@@ -78,6 +78,20 @@ describe "Struct.new" do
     end
   end
 
+  ruby_version_is ""..."3.3" do
+    it "raises ArgumentError if not provided any arguments" do
+      -> { Struct.new }.should raise_error(ArgumentError)
+    end
+  end
+
+  ruby_version_is "3.3" do
+    it "works when not provided any arguments" do
+      c = Struct.new
+      c.should be_kind_of(Class)
+      c.superclass.should == Struct
+    end
+  end
+
   it "raises ArgumentError when there is a duplicate member" do
     -> { Struct.new(:foo, :foo) }.should raise_error(ArgumentError, "duplicate member: foo")
   end