Ensure raw tag has no arguments

lib/liquid/locales/en.yml

@@ -1,6 +1,7 @@
 ---
   errors:
     syntax:
+      tag_unexpected_args: "Syntax Error in '%{tag}' - Valid syntax: %{tag}"
       assign: "Syntax Error in 'assign' - Valid syntax: assign [var] = [source]"
       capture: "Syntax Error in 'capture' - Valid syntax: capture [var]"
       case: "Syntax Error in 'case' - Valid syntax: case [condition]"

lib/liquid/tags/raw.rb

@@ -1,7 +1,16 @@
 module Liquid
   class Raw < Block
+    Syntax = /\A\s*\z/om
     FullTokenPossiblyInvalid = /\A(.*)#{TagStart}\s*(\w+)\s*(.*)?#{TagEnd}\z/om
 
+    def initialize(tag_name, markup, options)
+      super
+
+      unless markup =~ Syntax
+        raise SyntaxError.new(@options[:locale].t("errors.syntax.tag_unexpected_args".freeze, tag: tag_name))
+      end
+    end
+
     def parse(tokens)
       @body = ''
       while token = tokens.shift

test/integration/tags/raw_tag_test.rb

@@ -24,6 +24,7 @@ class RawTagTest < Minitest::Test
   end
 
   def test_invalid_raw
-    assert_match_syntax_error /tag was never closed/, '{% raw } foo {% endraw %}'
+    assert_match_syntax_error /tag was never closed/, '{% raw %} foo'
+    assert_match_syntax_error /Valid syntax/, '{% raw } foo %}{% endraw %}'
   end
 end