Raise SyntaxError if raw tag is unclosed

lib/liquid/tags/raw.rb

@@ -11,6 +11,8 @@ module Liquid
         end
         @body << token unless token.empty?
       end
+
+      raise SyntaxError.new(@options[:locale].t("errors.syntax.tag_never_closed".freeze, block_name: block_name))
     end
 
     def render(_context)

test/integration/tags/raw_tag_test.rb

@@ -22,4 +22,8 @@ class RawTagTest < Minitest::Test
     assert_template_result ' test {% raw %} {% endraw %}', '{% raw %} test {% raw %} {% {% endraw %}endraw %}'
     assert_template_result ' Foobar {{ invalid 1', '{% raw %} Foobar {{ invalid {% endraw %}{{ 1 }}'
   end
+
+  def test_invalid_raw
+    assert_match_syntax_error /tag was never closed/, '{% raw } foo {% endraw %}'
+  end
 end

test/test_helper.rb

@@ -42,7 +42,7 @@ module Minitest
       assert_match expected, Template.parse(template).render!(assigns), message
     end
 
-    def assert_match_syntax_error(match, template, registers = {})
+    def assert_match_syntax_error(match, template, assigns = {})
       exception = assert_raises(Liquid::SyntaxError) {
         Template.parse(template).render(assigns)
       }