Allow :id to start with the word contains

test/integration/parsing_quirks_test.rb

@@ -115,4 +115,8 @@ class ParsingQuirksTest < Minitest::Test
       assert_template_result('12345', "{% for i in (1...5) %}{{ i }}{% endfor %}")
     end
   end
+
+  def test_contains_in_id
+    assert_template_result(' YES ', '{% if containsallshipments == true %} YES {% endif %}', 'containsallshipments' => true)
+  end
 end # ParsingQuirksTest

test/unit/lexer_unit_test.rb

@@ -19,7 +19,7 @@ class LexerUnitTest < Minitest::Test
   end
 
   def test_comparison
-    tokens = Lexer.new('== <> contains').tokenize
+    tokens = Lexer.new('== <> contains ').tokenize
     assert_equal [[:comparison, '=='], [:comparison, '<>'], [:comparison, 'contains'], [:end_of_string]], tokens
   end