Remove redunant logic

lib/liquid/tokenizer.rb

@@ -66,9 +66,6 @@ module Liquid
           s = S_VAR
           output << current
           current = t
-        elsif t == T_VAR_OPEN && s == S_TAG
-          s = S_VAR
-          current += t
         elsif t == T_SIN_QUOT && s == S_TAG
           s = S_TAG_SIN
           current += t

test/integration/tags/assign_tag_test.rb

@@ -1,3 +1,5 @@
+# frozen_string_literal: true
+
 require 'test_helper'
 
 class AssignTagTest < Minitest::Test
@@ -14,5 +16,4 @@ class AssignTagTest < Minitest::Test
   def test_liquid_issue_701
     assert_template_result(" contents: _{% endraw %}_", "{% assign endraw = '{% endraw %}' %} contents: _{{endraw}}_")
   end
-
-end
+end