diff --git a/scenario/variable/gvar.rb b/scenario/variable/gvar.rb
index 83fe2d2b..16ce1121 100644
--- a/scenario/variable/gvar.rb
+++ b/scenario/variable/gvar.rb
@@ -11,19 +11,9 @@ def baz
   $VERBOSE
 end
 
-def nth_group_of_last_match
-  [$1, $2, $3, $4, $5, $6, $7, $8, $9, $10]
-end
-
-def back_reference
-  $&
-end
-
 ## assert
 class Object
   def foo: -> String
   def bar: -> String
   def baz: -> bool?
-  def nth_group_of_last_match: -> [String, String, String, String, String, String, String, String, String, String]
-  def back_reference: -> String
 end
diff --git a/scenario/variable/special-vars.rb b/scenario/variable/special-vars.rb
new file mode 100644
index 00000000..01f6dcc8
--- /dev/null
+++ b/scenario/variable/special-vars.rb
@@ -0,0 +1,14 @@
+## update
+def nth_group_of_last_match
+  [$1, $2, $3, $4, $5, $6, $7, $8, $9, $10]
+end
+
+def back_reference
+  $&
+end
+
+## assert
+class Object
+  def nth_group_of_last_match: -> [String, String, String, String, String, String, String, String, String, String]
+  def back_reference: -> String
+end