Use working example.rb file

Author: Rick Winfrey

languages/tree-sitter-stack-graphs-ruby/example.rb

@@ -0,0 +1,36 @@
+module A
+  CONST = 1
+  def a; end
+end
+
+module B
+  include A
+
+  def b; end
+end
+
+include B
+
+C = Module.new do
+  def c; end
+  def b
+    puts "c"
+  end
+end
+
+self.extend(C)
+
+class D
+  include C
+
+  def calling_a
+    puts "calling a: #{a}"
+  end
+
+  def calling_c
+    puts "calling c: #{c}"
+  end
+end
+
+d = D.new
+d.b # => "c"