diff --git a/test/integration/parsing_quirks_test.rb b/test/integration/parsing_quirks_test.rb
index f2167af..b24bc14 100644
--- a/test/integration/parsing_quirks_test.rb
+++ b/test/integration/parsing_quirks_test.rb
@@ -103,4 +103,11 @@ class ParsingQuirksTest < Minitest::Test
     end
   end
 
+  def test_invalid_variables_work
+    with_error_mode(:lax) do
+      assert_template_result('bar', "{% assign 123foo = 'bar' %}{{ 123foo }}")
+      assert_template_result('123', "{% assign 123 = 'bar' %}{{ 123 }}")
+    end
+  end
+
 end # ParsingQuirksTest