diff --git a/include/iris/alloy/adapt.hpp b/include/iris/alloy/adapt.hpp
index 99946f3c2..a98dcc876 100644
--- a/include/iris/alloy/adapt.hpp
+++ b/include/iris/alloy/adapt.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_ALLOY_ADAPT_HPP
-#define IRIS_ALLOY_ADAPT_HPP
+#ifndef IRIS_ZZ_ALLOY_ADAPT_HPP
+#define IRIS_ZZ_ALLOY_ADAPT_HPP
 
 /*=============================================================================
     Copyright (c) 2025 Yaito Kakeyama
diff --git a/include/iris/alloy/adapted/std_pair.hpp b/include/iris/alloy/adapted/std_pair.hpp
index 7ddef5e34..0f260a838 100644
--- a/include/iris/alloy/adapted/std_pair.hpp
+++ b/include/iris/alloy/adapted/std_pair.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_ALLOY_ADAPTED_STD_PAIR_HPP
-#define IRIS_ALLOY_ADAPTED_STD_PAIR_HPP
+#ifndef IRIS_ZZ_ALLOY_ADAPTED_STD_PAIR_HPP
+#define IRIS_ZZ_ALLOY_ADAPTED_STD_PAIR_HPP
 
 /*=============================================================================
     Copyright (c) 2025 Yaito Kakeyama
diff --git a/include/iris/alloy/adapted/std_tuple.hpp b/include/iris/alloy/adapted/std_tuple.hpp
index ed8306e30..49a0b1f53 100644
--- a/include/iris/alloy/adapted/std_tuple.hpp
+++ b/include/iris/alloy/adapted/std_tuple.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_ALLOY_ADAPTED_STD_TUPLE_HPP
-#define IRIS_ALLOY_ADAPTED_STD_TUPLE_HPP
+#ifndef IRIS_ZZ_ALLOY_ADAPTED_STD_TUPLE_HPP
+#define IRIS_ZZ_ALLOY_ADAPTED_STD_TUPLE_HPP
 
 /*=============================================================================
     Copyright (c) 2025 Yaito Kakeyama
diff --git a/include/iris/alloy/detail/deduce.hpp b/include/iris/alloy/detail/deduce.hpp
index 141de7976..0f095c5c0 100644
--- a/include/iris/alloy/detail/deduce.hpp
+++ b/include/iris/alloy/detail/deduce.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_ALLOY_DETAIL_DEDUCE_HPP
-#define IRIS_ALLOY_DETAIL_DEDUCE_HPP
+#ifndef IRIS_ZZ_ALLOY_DETAIL_DEDUCE_HPP
+#define IRIS_ZZ_ALLOY_DETAIL_DEDUCE_HPP
 
 /*=============================================================================
     Copyright (c) 2025 Yaito Kakeyama
diff --git a/include/iris/alloy/detail/integer_seq_transform.hpp b/include/iris/alloy/detail/integer_seq_transform.hpp
index caa47bda9..02ac93e88 100644
--- a/include/iris/alloy/detail/integer_seq_transform.hpp
+++ b/include/iris/alloy/detail/integer_seq_transform.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_ALLOY_DETAIL_INTEGER_SEQ_TRANSFORM_HPP
-#define IRIS_ALLOY_DETAIL_INTEGER_SEQ_TRANSFORM_HPP
+#ifndef IRIS_ZZ_ALLOY_DETAIL_INTEGER_SEQ_TRANSFORM_HPP
+#define IRIS_ZZ_ALLOY_DETAIL_INTEGER_SEQ_TRANSFORM_HPP
 
 /*=============================================================================
     Copyright (c) 2025 Yaito Kakeyama
diff --git a/include/iris/alloy/detail/preprocessed/tuple_impl.hpp.pre.in b/include/iris/alloy/detail/preprocessed/tuple_impl.hpp.pre.in
index 36138c5a6..bea50f60e 100644
--- a/include/iris/alloy/detail/preprocessed/tuple_impl.hpp.pre.in
+++ b/include/iris/alloy/detail/preprocessed/tuple_impl.hpp.pre.in
@@ -1,5 +1,5 @@
-#ifndef IRIS_ALLOY_DETAIL_PREPROCESSED_TUPLE_IMPL_HPP
-#define IRIS_ALLOY_DETAIL_PREPROCESSED_TUPLE_IMPL_HPP
+#ifndef IRIS_ZZ_ALLOY_DETAIL_PREPROCESSED_TUPLE_IMPL_HPP
+#define IRIS_ZZ_ALLOY_DETAIL_PREPROCESSED_TUPLE_IMPL_HPP
 
 /*=============================================================================
     Copyright (c) 2025 Yaito Kakeyama
diff --git a/include/iris/alloy/detail/tuple_comparison.hpp b/include/iris/alloy/detail/tuple_comparison.hpp
index d6d561cdd..fcbd69cad 100644
--- a/include/iris/alloy/detail/tuple_comparison.hpp
+++ b/include/iris/alloy/detail/tuple_comparison.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_ALLOY_DETAIL_TUPLE_COMPARISON_HPP
-#define IRIS_ALLOY_DETAIL_TUPLE_COMPARISON_HPP
+#ifndef IRIS_ZZ_ALLOY_DETAIL_TUPLE_COMPARISON_HPP
+#define IRIS_ZZ_ALLOY_DETAIL_TUPLE_COMPARISON_HPP
 
 /*=============================================================================
     Copyright (c) 2025 Yaito Kakeyama
diff --git a/include/iris/alloy/detail/tuple_impl.hpp b/include/iris/alloy/detail/tuple_impl.hpp
index 95473e21f..547714a4b 100644
--- a/include/iris/alloy/detail/tuple_impl.hpp
+++ b/include/iris/alloy/detail/tuple_impl.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_ALLOY_DETAIL_TUPLE_IMPL_HPP
-#define IRIS_ALLOY_DETAIL_TUPLE_IMPL_HPP
+#ifndef IRIS_ZZ_ALLOY_DETAIL_TUPLE_IMPL_HPP
+#define IRIS_ZZ_ALLOY_DETAIL_TUPLE_IMPL_HPP
 
 /*=============================================================================
     Copyright (c) 2025 Yaito Kakeyama
diff --git a/include/iris/alloy/io.hpp b/include/iris/alloy/io.hpp
index f619bd7bb..675515e8d 100644
--- a/include/iris/alloy/io.hpp
+++ b/include/iris/alloy/io.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_ALLOY_IO_HPP
-#define IRIS_ALLOY_IO_HPP
+#ifndef IRIS_ZZ_ALLOY_IO_HPP
+#define IRIS_ZZ_ALLOY_IO_HPP
 
 /*=============================================================================
     Copyright (c) 2025 Yaito Kakeyama
diff --git a/include/iris/alloy/traits.hpp b/include/iris/alloy/traits.hpp
index afcae7f71..0b510cce4 100644
--- a/include/iris/alloy/traits.hpp
+++ b/include/iris/alloy/traits.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_ALLOY_COMMON_DEF_HPP
-#define IRIS_ALLOY_COMMON_DEF_HPP
+#ifndef IRIS_ZZ_ALLOY_COMMON_DEF_HPP
+#define IRIS_ZZ_ALLOY_COMMON_DEF_HPP
 
 /*=============================================================================
     Copyright (c) 2025 Yaito Kakeyama
diff --git a/include/iris/alloy/tuple.hpp b/include/iris/alloy/tuple.hpp
index 824825fa5..5b21b725a 100644
--- a/include/iris/alloy/tuple.hpp
+++ b/include/iris/alloy/tuple.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_ALLOY_TUPLE_HPP
-#define IRIS_ALLOY_TUPLE_HPP
+#ifndef IRIS_ZZ_ALLOY_TUPLE_HPP
+#define IRIS_ZZ_ALLOY_TUPLE_HPP
 
 /*=============================================================================
     Copyright (c) 2025 Yaito Kakeyama
@@ -280,7 +280,7 @@ class tuple : public detail::tuple_impl<Ts...>
     {
         base_type::operator=(other);
         return *this;
-    
+
     }
     constexpr tuple& operator=(tuple&& other)
         noexcept(std::conjunction_v<std::is_nothrow_move_assignable<Ts>...>)
@@ -301,7 +301,7 @@ class tuple : public detail::tuple_impl<Ts...>
         base_type::operator=(static_cast<detail::tuple_impl<Us...> const&>(other));
         return *this;
     }
-    
+
     template<class... Us>
         requires requires {
             requires sizeof...(Ts) == sizeof...(Us);
diff --git a/include/iris/alloy/utility.hpp b/include/iris/alloy/utility.hpp
index 90dd8cc8d..0f556a521 100644
--- a/include/iris/alloy/utility.hpp
+++ b/include/iris/alloy/utility.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_ALLOY_UTILITY_HPP
-#define IRIS_ALLOY_UTILITY_HPP
+#ifndef IRIS_ZZ_ALLOY_UTILITY_HPP
+#define IRIS_ZZ_ALLOY_UTILITY_HPP
 
 /*=============================================================================
     Copyright (c) 2025 Yaito Kakeyama
diff --git a/include/iris/x4.hpp b/include/iris/x4.hpp
index 84ab687bc..27d6bc77f 100644
--- a/include/iris/x4.hpp
+++ b/include/iris/x4.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_HPP
-#define IRIS_X4_HPP
+#ifndef IRIS_ZZ_X4_HPP
+#define IRIS_ZZ_X4_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2013 Joel de Guzman
diff --git a/include/iris/x4/allocator.hpp b/include/iris/x4/allocator.hpp
index f1d0de892..6b3100309 100644
--- a/include/iris/x4/allocator.hpp
+++ b/include/iris/x4/allocator.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_ALLOCATOR_HPP
-#define IRIS_X4_ALLOCATOR_HPP
+#ifndef IRIS_ZZ_X4_ALLOCATOR_HPP
+#define IRIS_ZZ_X4_ALLOCATOR_HPP
 
 /*=============================================================================
     Copyright (c) 2025 Nana Sakisaka
diff --git a/include/iris/x4/ast/position_tagged.hpp b/include/iris/x4/ast/position_tagged.hpp
index afb0be613..b7e05be71 100644
--- a/include/iris/x4/ast/position_tagged.hpp
+++ b/include/iris/x4/ast/position_tagged.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_AST_POSITION_TAGGED_HPP
-#define IRIS_X4_AST_POSITION_TAGGED_HPP
+#ifndef IRIS_ZZ_X4_AST_POSITION_TAGGED_HPP
+#define IRIS_ZZ_X4_AST_POSITION_TAGGED_HPP
 
 /*=============================================================================
     Copyright (c) 2014 Joel de Guzman
diff --git a/include/iris/x4/auxiliary.hpp b/include/iris/x4/auxiliary.hpp
index 4400b903c..6f9558d2d 100644
--- a/include/iris/x4/auxiliary.hpp
+++ b/include/iris/x4/auxiliary.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_AUXILIARY_HPP
-#define IRIS_X4_AUXILIARY_HPP
+#ifndef IRIS_ZZ_X4_AUXILIARY_HPP
+#define IRIS_ZZ_X4_AUXILIARY_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/auxiliary/attr.hpp b/include/iris/x4/auxiliary/attr.hpp
index 0ce1ad43f..62e6f63db 100644
--- a/include/iris/x4/auxiliary/attr.hpp
+++ b/include/iris/x4/auxiliary/attr.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_AUXILIARY_ATTR_HPP
-#define IRIS_X4_AUXILIARY_ATTR_HPP
+#ifndef IRIS_ZZ_X4_AUXILIARY_ATTR_HPP
+#define IRIS_ZZ_X4_AUXILIARY_ATTR_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2011 Hartmut Kaiser
diff --git a/include/iris/x4/auxiliary/eoi.hpp b/include/iris/x4/auxiliary/eoi.hpp
index 92fb6b28d..426919743 100644
--- a/include/iris/x4/auxiliary/eoi.hpp
+++ b/include/iris/x4/auxiliary/eoi.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_AUXILIARY_EOI_HPP
-#define IRIS_X4_AUXILIARY_EOI_HPP
+#ifndef IRIS_ZZ_X4_AUXILIARY_EOI_HPP
+#define IRIS_ZZ_X4_AUXILIARY_EOI_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/auxiliary/eol.hpp b/include/iris/x4/auxiliary/eol.hpp
index d5fb0ca61..b52529aa7 100644
--- a/include/iris/x4/auxiliary/eol.hpp
+++ b/include/iris/x4/auxiliary/eol.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_AUXILIARY_EOL_HPP
-#define IRIS_X4_AUXILIARY_EOL_HPP
+#ifndef IRIS_ZZ_X4_AUXILIARY_EOL_HPP
+#define IRIS_ZZ_X4_AUXILIARY_EOL_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/auxiliary/eps.hpp b/include/iris/x4/auxiliary/eps.hpp
index 137221928..0c1f1165e 100644
--- a/include/iris/x4/auxiliary/eps.hpp
+++ b/include/iris/x4/auxiliary/eps.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_AUXILIARY_EPS_HPP
-#define IRIS_X4_AUXILIARY_EPS_HPP
+#ifndef IRIS_ZZ_X4_AUXILIARY_EPS_HPP
+#define IRIS_ZZ_X4_AUXILIARY_EPS_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/char.hpp b/include/iris/x4/char.hpp
index 8a2b873a1..8e1773114 100644
--- a/include/iris/x4/char.hpp
+++ b/include/iris/x4/char.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CHAR_HPP
-#define IRIS_X4_CHAR_HPP
+#ifndef IRIS_ZZ_X4_CHAR_HPP
+#define IRIS_ZZ_X4_CHAR_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/char/any_char.hpp b/include/iris/x4/char/any_char.hpp
index 1d4b359ba..6719ea0a9 100644
--- a/include/iris/x4/char/any_char.hpp
+++ b/include/iris/x4/char/any_char.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CHAR_ANY_CHAR_HPP
-#define IRIS_X4_CHAR_ANY_CHAR_HPP
+#ifndef IRIS_ZZ_X4_CHAR_ANY_CHAR_HPP
+#define IRIS_ZZ_X4_CHAR_ANY_CHAR_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/char/char.hpp b/include/iris/x4/char/char.hpp
index 948802958..7674ed135 100644
--- a/include/iris/x4/char/char.hpp
+++ b/include/iris/x4/char/char.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CHAR_CHAR_HPP
-#define IRIS_X4_CHAR_CHAR_HPP
+#ifndef IRIS_ZZ_X4_CHAR_CHAR_HPP
+#define IRIS_ZZ_X4_CHAR_CHAR_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/char/char_class.hpp b/include/iris/x4/char/char_class.hpp
index e03d697f1..925522667 100644
--- a/include/iris/x4/char/char_class.hpp
+++ b/include/iris/x4/char/char_class.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CHAR_CHAR_CLASS_HPP
-#define IRIS_X4_CHAR_CHAR_CLASS_HPP
+#ifndef IRIS_ZZ_X4_CHAR_CHAR_CLASS_HPP
+#define IRIS_ZZ_X4_CHAR_CHAR_CLASS_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/char/char_class_tags.hpp b/include/iris/x4/char/char_class_tags.hpp
index 862649eab..08c6263b7 100644
--- a/include/iris/x4/char/char_class_tags.hpp
+++ b/include/iris/x4/char/char_class_tags.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CHAR_CHAR_CLASS_TAGS_HPP
-#define IRIS_X4_CHAR_CHAR_CLASS_TAGS_HPP
+#ifndef IRIS_ZZ_X4_CHAR_CHAR_CLASS_TAGS_HPP
+#define IRIS_ZZ_X4_CHAR_CHAR_CLASS_TAGS_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/char/char_parser.hpp b/include/iris/x4/char/char_parser.hpp
index 50e6ffddd..53b196006 100644
--- a/include/iris/x4/char/char_parser.hpp
+++ b/include/iris/x4/char/char_parser.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CHAR_CHAR_PARSER_HPP
-#define IRIS_X4_CHAR_CHAR_PARSER_HPP
+#ifndef IRIS_ZZ_X4_CHAR_CHAR_PARSER_HPP
+#define IRIS_ZZ_X4_CHAR_CHAR_PARSER_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/char/char_set.hpp b/include/iris/x4/char/char_set.hpp
index 195f15d39..04efac39c 100644
--- a/include/iris/x4/char/char_set.hpp
+++ b/include/iris/x4/char/char_set.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CHAR_CHAR_SET_HPP
-#define IRIS_X4_CHAR_CHAR_SET_HPP
+#ifndef IRIS_ZZ_X4_CHAR_CHAR_SET_HPP
+#define IRIS_ZZ_X4_CHAR_CHAR_SET_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/char/detail/basic_chset.hpp b/include/iris/x4/char/detail/basic_chset.hpp
index 81eae5e13..f64ef9e3e 100644
--- a/include/iris/x4/char/detail/basic_chset.hpp
+++ b/include/iris/x4/char/detail/basic_chset.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CHAR_DETAIL_BASIC_CHSET_HPP
-#define IRIS_X4_CHAR_DETAIL_BASIC_CHSET_HPP
+#ifndef IRIS_ZZ_X4_CHAR_DETAIL_BASIC_CHSET_HPP
+#define IRIS_ZZ_X4_CHAR_DETAIL_BASIC_CHSET_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2011 Joel de Guzman
diff --git a/include/iris/x4/char/detail/cast_char.hpp b/include/iris/x4/char/detail/cast_char.hpp
index 38a90f2c8..ff8a62925 100644
--- a/include/iris/x4/char/detail/cast_char.hpp
+++ b/include/iris/x4/char/detail/cast_char.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CHAR_DETAIL_CAST_CHAR_HPP
-#define IRIS_X4_CHAR_DETAIL_CAST_CHAR_HPP
+#ifndef IRIS_ZZ_X4_CHAR_DETAIL_CAST_CHAR_HPP
+#define IRIS_ZZ_X4_CHAR_DETAIL_CAST_CHAR_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/char/detail/char_range.hpp b/include/iris/x4/char/detail/char_range.hpp
index dd32de268..6b1551ff7 100644
--- a/include/iris/x4/char/detail/char_range.hpp
+++ b/include/iris/x4/char/detail/char_range.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CHAR_DETAIL_CHAR_RANGE_HPP
-#define IRIS_X4_CHAR_DETAIL_CHAR_RANGE_HPP
+#ifndef IRIS_ZZ_X4_CHAR_DETAIL_CHAR_RANGE_HPP
+#define IRIS_ZZ_X4_CHAR_DETAIL_CHAR_RANGE_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2011 Joel de Guzman
diff --git a/include/iris/x4/char/detail/char_range_functions.hpp b/include/iris/x4/char/detail/char_range_functions.hpp
index 52c4c21c2..8dd238c0d 100644
--- a/include/iris/x4/char/detail/char_range_functions.hpp
+++ b/include/iris/x4/char/detail/char_range_functions.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CHAR_DETAIL_CHAR_RANGE_FUNCTIONS_HPP
-#define IRIS_X4_CHAR_DETAIL_CHAR_RANGE_FUNCTIONS_HPP
+#ifndef IRIS_ZZ_X4_CHAR_DETAIL_CHAR_RANGE_FUNCTIONS_HPP
+#define IRIS_ZZ_X4_CHAR_DETAIL_CHAR_RANGE_FUNCTIONS_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2011 Joel de Guzman
diff --git a/include/iris/x4/char/detail/char_range_run.hpp b/include/iris/x4/char/detail/char_range_run.hpp
index 8b1e013d0..abc0777c7 100644
--- a/include/iris/x4/char/detail/char_range_run.hpp
+++ b/include/iris/x4/char/detail/char_range_run.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CHAR_DETAIL_CHAR_RANGE_RUN_HPP
-#define IRIS_X4_CHAR_DETAIL_CHAR_RANGE_RUN_HPP
+#ifndef IRIS_ZZ_X4_CHAR_DETAIL_CHAR_RANGE_RUN_HPP
+#define IRIS_ZZ_X4_CHAR_DETAIL_CHAR_RANGE_RUN_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2011 Joel de Guzman
diff --git a/include/iris/x4/char/literal_char.hpp b/include/iris/x4/char/literal_char.hpp
index 8a8c0dbe2..4eba2d4b0 100644
--- a/include/iris/x4/char/literal_char.hpp
+++ b/include/iris/x4/char/literal_char.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CHAR_LITERAL_CHAR_HPP
-#define IRIS_X4_CHAR_LITERAL_CHAR_HPP
+#ifndef IRIS_ZZ_X4_CHAR_LITERAL_CHAR_HPP
+#define IRIS_ZZ_X4_CHAR_LITERAL_CHAR_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/char/negated_char.hpp b/include/iris/x4/char/negated_char.hpp
index af50b92f8..f2b94e61d 100644
--- a/include/iris/x4/char/negated_char.hpp
+++ b/include/iris/x4/char/negated_char.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CHAR_NEGATED_CHAR_HPP
-#define IRIS_X4_CHAR_NEGATED_CHAR_HPP
+#ifndef IRIS_ZZ_X4_CHAR_NEGATED_CHAR_HPP
+#define IRIS_ZZ_X4_CHAR_NEGATED_CHAR_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/char/unicode_char_class.hpp b/include/iris/x4/char/unicode_char_class.hpp
index 9efe5bb52..cb413b683 100644
--- a/include/iris/x4/char/unicode_char_class.hpp
+++ b/include/iris/x4/char/unicode_char_class.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CHAR_UNICODE_CHAR_CLASS_HPP
-#define IRIS_X4_CHAR_UNICODE_CHAR_CLASS_HPP
+#ifndef IRIS_ZZ_X4_CHAR_UNICODE_CHAR_CLASS_HPP
+#define IRIS_ZZ_X4_CHAR_UNICODE_CHAR_CLASS_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/char_encoding/standard.hpp b/include/iris/x4/char_encoding/standard.hpp
index d1b730346..c2f0c03d6 100644
--- a/include/iris/x4/char_encoding/standard.hpp
+++ b/include/iris/x4/char_encoding/standard.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CHAR_ENCODING_STANDARD_HPP
-#define IRIS_X4_CHAR_ENCODING_STANDARD_HPP
+#ifndef IRIS_ZZ_X4_CHAR_ENCODING_STANDARD_HPP
+#define IRIS_ZZ_X4_CHAR_ENCODING_STANDARD_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2011 Hartmut Kaiser
diff --git a/include/iris/x4/char_encoding/standard_wide.hpp b/include/iris/x4/char_encoding/standard_wide.hpp
index f2b4059d4..c8ed3e1d2 100644
--- a/include/iris/x4/char_encoding/standard_wide.hpp
+++ b/include/iris/x4/char_encoding/standard_wide.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CHAR_ENCODING_STANDARD_WIDE_HPP
-#define IRIS_X4_CHAR_ENCODING_STANDARD_WIDE_HPP
+#ifndef IRIS_ZZ_X4_CHAR_ENCODING_STANDARD_WIDE_HPP
+#define IRIS_ZZ_X4_CHAR_ENCODING_STANDARD_WIDE_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2011 Hartmut Kaiser
diff --git a/include/iris/x4/char_encoding/unicode.hpp b/include/iris/x4/char_encoding/unicode.hpp
index 4779db1f9..daa5b5743 100644
--- a/include/iris/x4/char_encoding/unicode.hpp
+++ b/include/iris/x4/char_encoding/unicode.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CHAR_ENCODING_UNICODE_HPP
-#define IRIS_X4_CHAR_ENCODING_UNICODE_HPP
+#ifndef IRIS_ZZ_X4_CHAR_ENCODING_UNICODE_HPP
+#define IRIS_ZZ_X4_CHAR_ENCODING_UNICODE_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2011 Hartmut Kaiser
diff --git a/include/iris/x4/char_encoding/unicode/classification.hpp b/include/iris/x4/char_encoding/unicode/classification.hpp
index 9c8c1a72d..68833be82 100644
--- a/include/iris/x4/char_encoding/unicode/classification.hpp
+++ b/include/iris/x4/char_encoding/unicode/classification.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CHAR_ENCODING_UNICODE_CLASSIFICATION_HPP
-#define IRIS_X4_CHAR_ENCODING_UNICODE_CLASSIFICATION_HPP
+#ifndef IRIS_ZZ_X4_CHAR_ENCODING_UNICODE_CLASSIFICATION_HPP
+#define IRIS_ZZ_X4_CHAR_ENCODING_UNICODE_CLASSIFICATION_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2011 Joel de Guzman
diff --git a/include/iris/x4/core/action.hpp b/include/iris/x4/core/action.hpp
index aeb90c3e6..fba6c57ab 100644
--- a/include/iris/x4/core/action.hpp
+++ b/include/iris/x4/core/action.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CORE_ACTION_HPP
-#define IRIS_X4_CORE_ACTION_HPP
+#ifndef IRIS_ZZ_X4_CORE_ACTION_HPP
+#define IRIS_ZZ_X4_CORE_ACTION_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/core/action_context.hpp b/include/iris/x4/core/action_context.hpp
index 4bc106d68..972497620 100644
--- a/include/iris/x4/core/action_context.hpp
+++ b/include/iris/x4/core/action_context.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CORE_ACTION_CONTEXT_HPP
-#define IRIS_X4_CORE_ACTION_CONTEXT_HPP
+#ifndef IRIS_ZZ_X4_CORE_ACTION_CONTEXT_HPP
+#define IRIS_ZZ_X4_CORE_ACTION_CONTEXT_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/core/attribute.hpp b/include/iris/x4/core/attribute.hpp
index 5cf5e12d0..74f689ce1 100644
--- a/include/iris/x4/core/attribute.hpp
+++ b/include/iris/x4/core/attribute.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CORE_ATTRIBUTE_HPP
-#define IRIS_X4_CORE_ATTRIBUTE_HPP
+#ifndef IRIS_ZZ_X4_CORE_ATTRIBUTE_HPP
+#define IRIS_ZZ_X4_CORE_ATTRIBUTE_HPP
 
 /*=============================================================================
     Copyright (c) 2025 Nana Sakisaka
diff --git a/include/iris/x4/core/container_appender.hpp b/include/iris/x4/core/container_appender.hpp
index 624390598..0b45adbe9 100644
--- a/include/iris/x4/core/container_appender.hpp
+++ b/include/iris/x4/core/container_appender.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CORE_CONTAINER_APPENDER_HPP
-#define IRIS_X4_CORE_CONTAINER_APPENDER_HPP
+#ifndef IRIS_ZZ_X4_CORE_CONTAINER_APPENDER_HPP
+#define IRIS_ZZ_X4_CORE_CONTAINER_APPENDER_HPP
 
 /*=============================================================================
     Copyright (c) 2025 Nana Sakisaka
diff --git a/include/iris/x4/core/context.hpp b/include/iris/x4/core/context.hpp
index 06f0dfd2e..ab57110e0 100644
--- a/include/iris/x4/core/context.hpp
+++ b/include/iris/x4/core/context.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CORE_CONTEXT_HPP
-#define IRIS_X4_CORE_CONTEXT_HPP
+#ifndef IRIS_ZZ_X4_CORE_CONTEXT_HPP
+#define IRIS_ZZ_X4_CORE_CONTEXT_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/core/detail/parse_alternative.hpp b/include/iris/x4/core/detail/parse_alternative.hpp
index 352330273..0cb5f9203 100644
--- a/include/iris/x4/core/detail/parse_alternative.hpp
+++ b/include/iris/x4/core/detail/parse_alternative.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CORE_DETAIL_PARSE_ALTERNATIVE_HPP
-#define IRIS_X4_CORE_DETAIL_PARSE_ALTERNATIVE_HPP
+#ifndef IRIS_ZZ_X4_CORE_DETAIL_PARSE_ALTERNATIVE_HPP
+#define IRIS_ZZ_X4_CORE_DETAIL_PARSE_ALTERNATIVE_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/core/detail/parse_into_container.hpp b/include/iris/x4/core/detail/parse_into_container.hpp
index 8a40b2493..0da6f707a 100644
--- a/include/iris/x4/core/detail/parse_into_container.hpp
+++ b/include/iris/x4/core/detail/parse_into_container.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CORE_DETAIL_PARSE_INTO_CONTAINER_HPP
-#define IRIS_X4_CORE_DETAIL_PARSE_INTO_CONTAINER_HPP
+#ifndef IRIS_ZZ_X4_CORE_DETAIL_PARSE_INTO_CONTAINER_HPP
+#define IRIS_ZZ_X4_CORE_DETAIL_PARSE_INTO_CONTAINER_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
@@ -215,7 +215,7 @@ parse_into_container(
     if constexpr (traits::is_variant_v<Attr>) {
         // e.g. `char` when the caller is `+char_`
         using attribute_type = parser_traits<Parser>::attribute_type;
-     
+
         // e.g. `std::string` when the attribute_type is `char`
         using substitute_type = traits::variant_find_substitute_t<Attr, traits::build_container_t<attribute_type>>;
 
diff --git a/include/iris/x4/core/detail/parse_sequence.hpp b/include/iris/x4/core/detail/parse_sequence.hpp
index eee6e0dcf..28df3abf1 100644
--- a/include/iris/x4/core/detail/parse_sequence.hpp
+++ b/include/iris/x4/core/detail/parse_sequence.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CORE_DETAIL_PARSE_SEQUENCE_HPP
-#define IRIS_X4_CORE_DETAIL_PARSE_SEQUENCE_HPP
+#ifndef IRIS_ZZ_X4_CORE_DETAIL_PARSE_SEQUENCE_HPP
+#define IRIS_ZZ_X4_CORE_DETAIL_PARSE_SEQUENCE_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/core/expectation.hpp b/include/iris/x4/core/expectation.hpp
index 8d545f2c8..19f9ea6bc 100644
--- a/include/iris/x4/core/expectation.hpp
+++ b/include/iris/x4/core/expectation.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CORE_EXPECTATION_HPP
-#define IRIS_X4_CORE_EXPECTATION_HPP
+#ifndef IRIS_ZZ_X4_CORE_EXPECTATION_HPP
+#define IRIS_ZZ_X4_CORE_EXPECTATION_HPP
 
 /*=============================================================================
     Copyright (c) 2017 wanghan02
diff --git a/include/iris/x4/core/move_to.hpp b/include/iris/x4/core/move_to.hpp
index 61c81534c..c87d7f8f4 100644
--- a/include/iris/x4/core/move_to.hpp
+++ b/include/iris/x4/core/move_to.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CORE_MOVE_TO_HPP
-#define IRIS_X4_CORE_MOVE_TO_HPP
+#ifndef IRIS_ZZ_X4_CORE_MOVE_TO_HPP
+#define IRIS_ZZ_X4_CORE_MOVE_TO_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/core/parser.hpp b/include/iris/x4/core/parser.hpp
index ede66cca2..7cd67f132 100644
--- a/include/iris/x4/core/parser.hpp
+++ b/include/iris/x4/core/parser.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CORE_PARSER_HPP
-#define IRIS_X4_CORE_PARSER_HPP
+#ifndef IRIS_ZZ_X4_CORE_PARSER_HPP
+#define IRIS_ZZ_X4_CORE_PARSER_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/core/parser_traits.hpp b/include/iris/x4/core/parser_traits.hpp
index 85d2ce501..b5f98abdc 100644
--- a/include/iris/x4/core/parser_traits.hpp
+++ b/include/iris/x4/core/parser_traits.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CORE_PARSER_TRAITS_HPP
-#define IRIS_X4_CORE_PARSER_TRAITS_HPP
+#ifndef IRIS_ZZ_X4_CORE_PARSER_TRAITS_HPP
+#define IRIS_ZZ_X4_CORE_PARSER_TRAITS_HPP
 
 /*=============================================================================
     Copyright (c) 2025 Nana Sakisaka
diff --git a/include/iris/x4/core/skip_over.hpp b/include/iris/x4/core/skip_over.hpp
index d312c6f95..51a9f6eeb 100644
--- a/include/iris/x4/core/skip_over.hpp
+++ b/include/iris/x4/core/skip_over.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CORE_SKIP_OVER_HPP
-#define IRIS_X4_CORE_SKIP_OVER_HPP
+#ifndef IRIS_ZZ_X4_CORE_SKIP_OVER_HPP
+#define IRIS_ZZ_X4_CORE_SKIP_OVER_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/core/unused.hpp b/include/iris/x4/core/unused.hpp
index 100cf2034..99ac567fb 100644
--- a/include/iris/x4/core/unused.hpp
+++ b/include/iris/x4/core/unused.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_CORE_UNUSED_HPP
-#define IRIS_X4_CORE_UNUSED_HPP
+#ifndef IRIS_ZZ_X4_CORE_UNUSED_HPP
+#define IRIS_ZZ_X4_CORE_UNUSED_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/debug/annotate.hpp b/include/iris/x4/debug/annotate.hpp
index 77e05a477..bdd000e4d 100644
--- a/include/iris/x4/debug/annotate.hpp
+++ b/include/iris/x4/debug/annotate.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_DEBUG_ANNOTATE_HPP
-#define IRIS_X4_DEBUG_ANNOTATE_HPP
+#ifndef IRIS_ZZ_X4_DEBUG_ANNOTATE_HPP
+#define IRIS_ZZ_X4_DEBUG_ANNOTATE_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2015 Joel de Guzman
diff --git a/include/iris/x4/debug/annotate_on_success.hpp b/include/iris/x4/debug/annotate_on_success.hpp
index e8d479b40..eb5c1ff4a 100644
--- a/include/iris/x4/debug/annotate_on_success.hpp
+++ b/include/iris/x4/debug/annotate_on_success.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_DEBUG_ANNOTATE_ON_SUCCESS_HPP
-#define IRIS_X4_DEBUG_ANNOTATE_ON_SUCCESS_HPP
+#ifndef IRIS_ZZ_X4_DEBUG_ANNOTATE_ON_SUCCESS_HPP
+#define IRIS_ZZ_X4_DEBUG_ANNOTATE_ON_SUCCESS_HPP
 
 /*=============================================================================
     Copyright (c) 2026 The Iris Project Contributors
diff --git a/include/iris/x4/debug/default_error_handler.hpp b/include/iris/x4/debug/default_error_handler.hpp
index 02d880e5b..efe194e0c 100644
--- a/include/iris/x4/debug/default_error_handler.hpp
+++ b/include/iris/x4/debug/default_error_handler.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_DEBUG_ERROR_REPORTING_HPP
-#define IRIS_X4_DEBUG_ERROR_REPORTING_HPP
+#ifndef IRIS_ZZ_X4_DEBUG_ERROR_REPORTING_HPP
+#define IRIS_ZZ_X4_DEBUG_ERROR_REPORTING_HPP
 
 /*=============================================================================
     Copyright (c) 2014 Joel de Guzman
diff --git a/include/iris/x4/debug/error_handler.hpp b/include/iris/x4/debug/error_handler.hpp
index 5257eda80..1c1f5830a 100644
--- a/include/iris/x4/debug/error_handler.hpp
+++ b/include/iris/x4/debug/error_handler.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_DEBUG_ERROR_HANDLER_HPP
-#define IRIS_X4_DEBUG_ERROR_HANDLER_HPP
+#ifndef IRIS_ZZ_X4_DEBUG_ERROR_HANDLER_HPP
+#define IRIS_ZZ_X4_DEBUG_ERROR_HANDLER_HPP
 
 /*=============================================================================
     Copyright (c) 2026 The Iris Project Contributors
diff --git a/include/iris/x4/debug/print_attribute.hpp b/include/iris/x4/debug/print_attribute.hpp
index c167ea8fe..650641993 100644
--- a/include/iris/x4/debug/print_attribute.hpp
+++ b/include/iris/x4/debug/print_attribute.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_DEBUG_PRINT_ATTRIBUTE_HPP
-#define IRIS_X4_DEBUG_PRINT_ATTRIBUTE_HPP
+#ifndef IRIS_ZZ_X4_DEBUG_PRINT_ATTRIBUTE_HPP
+#define IRIS_ZZ_X4_DEBUG_PRINT_ATTRIBUTE_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/debug/print_token.hpp b/include/iris/x4/debug/print_token.hpp
index 5f3693d4d..16816de05 100644
--- a/include/iris/x4/debug/print_token.hpp
+++ b/include/iris/x4/debug/print_token.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_DEBUG_PRINT_TOKEN_HPP
-#define IRIS_X4_DEBUG_PRINT_TOKEN_HPP
+#ifndef IRIS_ZZ_X4_DEBUG_PRINT_TOKEN_HPP
+#define IRIS_ZZ_X4_DEBUG_PRINT_TOKEN_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/directive.hpp b/include/iris/x4/directive.hpp
index 8df3e5f96..20fe1595c 100644
--- a/include/iris/x4/directive.hpp
+++ b/include/iris/x4/directive.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_DIRECTIVE_HPP
-#define IRIS_X4_DIRECTIVE_HPP
+#ifndef IRIS_ZZ_X4_DIRECTIVE_HPP
+#define IRIS_ZZ_X4_DIRECTIVE_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2015 Joel de Guzman
diff --git a/include/iris/x4/directive/as.hpp b/include/iris/x4/directive/as.hpp
index 0b5209efc..a61d946f4 100644
--- a/include/iris/x4/directive/as.hpp
+++ b/include/iris/x4/directive/as.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_DIRECTIVE_AS_HPP
-#define IRIS_X4_DIRECTIVE_AS_HPP
+#ifndef IRIS_ZZ_X4_DIRECTIVE_AS_HPP
+#define IRIS_ZZ_X4_DIRECTIVE_AS_HPP
 
 /*=============================================================================
     Copyright (c) 2025 Nana Sakisaka
diff --git a/include/iris/x4/directive/expect.hpp b/include/iris/x4/directive/expect.hpp
index cd2c4acfa..411995dbf 100644
--- a/include/iris/x4/directive/expect.hpp
+++ b/include/iris/x4/directive/expect.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_DIRECTIVE_EXPECT_HPP
-#define IRIS_X4_DIRECTIVE_EXPECT_HPP
+#ifndef IRIS_ZZ_X4_DIRECTIVE_EXPECT_HPP
+#define IRIS_ZZ_X4_DIRECTIVE_EXPECT_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/directive/lexeme.hpp b/include/iris/x4/directive/lexeme.hpp
index 69abba35b..f14118091 100644
--- a/include/iris/x4/directive/lexeme.hpp
+++ b/include/iris/x4/directive/lexeme.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_DIRECTIVE_LEXEME_HPP
-#define IRIS_X4_DIRECTIVE_LEXEME_HPP
+#ifndef IRIS_ZZ_X4_DIRECTIVE_LEXEME_HPP
+#define IRIS_ZZ_X4_DIRECTIVE_LEXEME_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/directive/matches.hpp b/include/iris/x4/directive/matches.hpp
index 0cd981348..9e7be6218 100644
--- a/include/iris/x4/directive/matches.hpp
+++ b/include/iris/x4/directive/matches.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_DIRECTIVE_MATCHES_HPP
-#define IRIS_X4_DIRECTIVE_MATCHES_HPP
+#ifndef IRIS_ZZ_X4_DIRECTIVE_MATCHES_HPP
+#define IRIS_ZZ_X4_DIRECTIVE_MATCHES_HPP
 
 /*=============================================================================
     Copyright (c) 2015 Mario Lang
diff --git a/include/iris/x4/directive/no_case.hpp b/include/iris/x4/directive/no_case.hpp
index b4b978ec5..f1dfe4f9b 100644
--- a/include/iris/x4/directive/no_case.hpp
+++ b/include/iris/x4/directive/no_case.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_DIRECTIVE_NO_CASE_HPP
-#define IRIS_X4_DIRECTIVE_NO_CASE_HPP
+#ifndef IRIS_ZZ_X4_DIRECTIVE_NO_CASE_HPP
+#define IRIS_ZZ_X4_DIRECTIVE_NO_CASE_HPP
 
 /*=============================================================================
     Copyright (c) 2014 Thomas Bernard
diff --git a/include/iris/x4/directive/no_skip.hpp b/include/iris/x4/directive/no_skip.hpp
index 4f8efe0f5..f1436220a 100644
--- a/include/iris/x4/directive/no_skip.hpp
+++ b/include/iris/x4/directive/no_skip.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_DIRECTIVE_NO_SKIP_HPP
-#define IRIS_X4_DIRECTIVE_NO_SKIP_HPP
+#ifndef IRIS_ZZ_X4_DIRECTIVE_NO_SKIP_HPP
+#define IRIS_ZZ_X4_DIRECTIVE_NO_SKIP_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/directive/omit.hpp b/include/iris/x4/directive/omit.hpp
index 5574adf3f..8d75e98b9 100644
--- a/include/iris/x4/directive/omit.hpp
+++ b/include/iris/x4/directive/omit.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_DIRECTIVE_OMIT_HPP
-#define IRIS_X4_DIRECTIVE_OMIT_HPP
+#ifndef IRIS_ZZ_X4_DIRECTIVE_OMIT_HPP
+#define IRIS_ZZ_X4_DIRECTIVE_OMIT_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/directive/raw.hpp b/include/iris/x4/directive/raw.hpp
index 6c9e0465e..00a27f987 100644
--- a/include/iris/x4/directive/raw.hpp
+++ b/include/iris/x4/directive/raw.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_DIRECTIVE_RAW_HPP
-#define IRIS_X4_DIRECTIVE_RAW_HPP
+#ifndef IRIS_ZZ_X4_DIRECTIVE_RAW_HPP
+#define IRIS_ZZ_X4_DIRECTIVE_RAW_HPP
 
 /*=============================================================================
     Copyright (c) 2014 Joel de Guzman
diff --git a/include/iris/x4/directive/repeat.hpp b/include/iris/x4/directive/repeat.hpp
index fe728736b..9dc8db3c2 100644
--- a/include/iris/x4/directive/repeat.hpp
+++ b/include/iris/x4/directive/repeat.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_DIRECTIVE_REPEAT_HPP
-#define IRIS_X4_DIRECTIVE_REPEAT_HPP
+#ifndef IRIS_ZZ_X4_DIRECTIVE_REPEAT_HPP
+#define IRIS_ZZ_X4_DIRECTIVE_REPEAT_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2011 Joel de Guzman
diff --git a/include/iris/x4/directive/seek.hpp b/include/iris/x4/directive/seek.hpp
index 7bc676829..7d98ce4ff 100644
--- a/include/iris/x4/directive/seek.hpp
+++ b/include/iris/x4/directive/seek.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_DIRECTIVE_SEEK_HPP
-#define IRIS_X4_DIRECTIVE_SEEK_HPP
+#ifndef IRIS_ZZ_X4_DIRECTIVE_SEEK_HPP
+#define IRIS_ZZ_X4_DIRECTIVE_SEEK_HPP
 
 /*=============================================================================
     Copyright (c) 2011 Jamboree
diff --git a/include/iris/x4/directive/skip.hpp b/include/iris/x4/directive/skip.hpp
index 33c594e3d..2b788f5c6 100644
--- a/include/iris/x4/directive/skip.hpp
+++ b/include/iris/x4/directive/skip.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_DIRECTIVE_SKIP_HPP
-#define IRIS_X4_DIRECTIVE_SKIP_HPP
+#ifndef IRIS_ZZ_X4_DIRECTIVE_SKIP_HPP
+#define IRIS_ZZ_X4_DIRECTIVE_SKIP_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/directive/with.hpp b/include/iris/x4/directive/with.hpp
index a7331ed0e..faf2364f0 100644
--- a/include/iris/x4/directive/with.hpp
+++ b/include/iris/x4/directive/with.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_DIRECTIVE_WITH_HPP
-#define IRIS_X4_DIRECTIVE_WITH_HPP
+#ifndef IRIS_ZZ_X4_DIRECTIVE_WITH_HPP
+#define IRIS_ZZ_X4_DIRECTIVE_WITH_HPP
 
 /*=============================================================================
     Copyright (c) 2014 Joel de Guzman
diff --git a/include/iris/x4/directive/with_local.hpp b/include/iris/x4/directive/with_local.hpp
index 99b84d494..2d09c98a0 100644
--- a/include/iris/x4/directive/with_local.hpp
+++ b/include/iris/x4/directive/with_local.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_DIRECTIVE_WITH_LOCAL_HPP
-#define IRIS_X4_DIRECTIVE_WITH_LOCAL_HPP
+#ifndef IRIS_ZZ_X4_DIRECTIVE_WITH_LOCAL_HPP
+#define IRIS_ZZ_X4_DIRECTIVE_WITH_LOCAL_HPP
 
 /*=============================================================================
     Copyright (c) 2025 Nana Sakisaka
diff --git a/include/iris/x4/directive/without.hpp b/include/iris/x4/directive/without.hpp
index aadf1a87e..123f414b1 100644
--- a/include/iris/x4/directive/without.hpp
+++ b/include/iris/x4/directive/without.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_DIRECTIVE_WITHOUT_HPP
-#define IRIS_X4_DIRECTIVE_WITHOUT_HPP
+#ifndef IRIS_ZZ_X4_DIRECTIVE_WITHOUT_HPP
+#define IRIS_ZZ_X4_DIRECTIVE_WITHOUT_HPP
 
 /*=============================================================================
     Copyright (c) 2026 The Iris Project Contributors
diff --git a/include/iris/x4/numeric.hpp b/include/iris/x4/numeric.hpp
index ddb2f97bd..46b28b3da 100644
--- a/include/iris/x4/numeric.hpp
+++ b/include/iris/x4/numeric.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_NUMERIC_HPP
-#define IRIS_X4_NUMERIC_HPP
+#ifndef IRIS_ZZ_X4_NUMERIC_HPP
+#define IRIS_ZZ_X4_NUMERIC_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/numeric/bool.hpp b/include/iris/x4/numeric/bool.hpp
index 34be02807..42703f1c9 100644
--- a/include/iris/x4/numeric/bool.hpp
+++ b/include/iris/x4/numeric/bool.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_NUMERIC_BOOL_HPP
-#define IRIS_X4_NUMERIC_BOOL_HPP
+#ifndef IRIS_ZZ_X4_NUMERIC_BOOL_HPP
+#define IRIS_ZZ_X4_NUMERIC_BOOL_HPP
 
 /*=============================================================================
     Copyright (c) 2009 Hartmut Kaiser
diff --git a/include/iris/x4/numeric/int.hpp b/include/iris/x4/numeric/int.hpp
index 13d18db9b..1cb5fc297 100644
--- a/include/iris/x4/numeric/int.hpp
+++ b/include/iris/x4/numeric/int.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_NUMERIC_INT_HPP
-#define IRIS_X4_NUMERIC_INT_HPP
+#ifndef IRIS_ZZ_X4_NUMERIC_INT_HPP
+#define IRIS_ZZ_X4_NUMERIC_INT_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/numeric/real.hpp b/include/iris/x4/numeric/real.hpp
index 6792bba9c..efcab1012 100644
--- a/include/iris/x4/numeric/real.hpp
+++ b/include/iris/x4/numeric/real.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_NUMERIC_REAL_HPP
-#define IRIS_X4_NUMERIC_REAL_HPP
+#ifndef IRIS_ZZ_X4_NUMERIC_REAL_HPP
+#define IRIS_ZZ_X4_NUMERIC_REAL_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/numeric/uint.hpp b/include/iris/x4/numeric/uint.hpp
index f33827c2b..648cb9f1e 100644
--- a/include/iris/x4/numeric/uint.hpp
+++ b/include/iris/x4/numeric/uint.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_NUMERIC_UINT_HPP
-#define IRIS_X4_NUMERIC_UINT_HPP
+#ifndef IRIS_ZZ_X4_NUMERIC_UINT_HPP
+#define IRIS_ZZ_X4_NUMERIC_UINT_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/numeric/utils/extract_int.hpp b/include/iris/x4/numeric/utils/extract_int.hpp
index 3502a8ebf..9520d7ddb 100644
--- a/include/iris/x4/numeric/utils/extract_int.hpp
+++ b/include/iris/x4/numeric/utils/extract_int.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_NUMERIC_UTILS_EXTRACT_INT_HPP
-#define IRIS_X4_NUMERIC_UTILS_EXTRACT_INT_HPP
+#ifndef IRIS_ZZ_X4_NUMERIC_UTILS_EXTRACT_INT_HPP
+#define IRIS_ZZ_X4_NUMERIC_UTILS_EXTRACT_INT_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/numeric/utils/extract_real.hpp b/include/iris/x4/numeric/utils/extract_real.hpp
index 926f337ea..e87b0b6fa 100644
--- a/include/iris/x4/numeric/utils/extract_real.hpp
+++ b/include/iris/x4/numeric/utils/extract_real.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_NUMERIC_UTILS_EXTRACT_REAL_HPP
-#define IRIS_X4_NUMERIC_UTILS_EXTRACT_REAL_HPP
+#ifndef IRIS_ZZ_X4_NUMERIC_UTILS_EXTRACT_REAL_HPP
+#define IRIS_ZZ_X4_NUMERIC_UTILS_EXTRACT_REAL_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/numeric/utils/pow10.hpp b/include/iris/x4/numeric/utils/pow10.hpp
index ed8d3b25e..aca8afe77 100644
--- a/include/iris/x4/numeric/utils/pow10.hpp
+++ b/include/iris/x4/numeric/utils/pow10.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_NUMERIC_UTILS_POW10_HPP
-#define IRIS_X4_NUMERIC_UTILS_POW10_HPP
+#ifndef IRIS_ZZ_X4_NUMERIC_UTILS_POW10_HPP
+#define IRIS_ZZ_X4_NUMERIC_UTILS_POW10_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/operator.hpp b/include/iris/x4/operator.hpp
index 798ece7be..dfcc0ef58 100644
--- a/include/iris/x4/operator.hpp
+++ b/include/iris/x4/operator.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_OPERATOR_HPP
-#define IRIS_X4_OPERATOR_HPP
+#ifndef IRIS_ZZ_X4_OPERATOR_HPP
+#define IRIS_ZZ_X4_OPERATOR_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/operator/alternative.hpp b/include/iris/x4/operator/alternative.hpp
index aefe652b3..03015241a 100644
--- a/include/iris/x4/operator/alternative.hpp
+++ b/include/iris/x4/operator/alternative.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_OPERATOR_ALTERNATIVE_HPP
-#define IRIS_X4_OPERATOR_ALTERNATIVE_HPP
+#ifndef IRIS_ZZ_X4_OPERATOR_ALTERNATIVE_HPP
+#define IRIS_ZZ_X4_OPERATOR_ALTERNATIVE_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/operator/and_predicate.hpp b/include/iris/x4/operator/and_predicate.hpp
index d0a8b70c7..cc5e61f98 100644
--- a/include/iris/x4/operator/and_predicate.hpp
+++ b/include/iris/x4/operator/and_predicate.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_OPERATOR_AND_PREDICATE_HPP
-#define IRIS_X4_OPERATOR_AND_PREDICATE_HPP
+#ifndef IRIS_ZZ_X4_OPERATOR_AND_PREDICATE_HPP
+#define IRIS_ZZ_X4_OPERATOR_AND_PREDICATE_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/operator/difference.hpp b/include/iris/x4/operator/difference.hpp
index b81144b12..a8f4d758f 100644
--- a/include/iris/x4/operator/difference.hpp
+++ b/include/iris/x4/operator/difference.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_OPERATOR_DIFFERENCE_HPP
-#define IRIS_X4_OPERATOR_DIFFERENCE_HPP
+#ifndef IRIS_ZZ_X4_OPERATOR_DIFFERENCE_HPP
+#define IRIS_ZZ_X4_OPERATOR_DIFFERENCE_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/operator/kleene.hpp b/include/iris/x4/operator/kleene.hpp
index 8589e2a8c..1785f3935 100644
--- a/include/iris/x4/operator/kleene.hpp
+++ b/include/iris/x4/operator/kleene.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_OPERATOR_KLEENE_HPP
-#define IRIS_X4_OPERATOR_KLEENE_HPP
+#ifndef IRIS_ZZ_X4_OPERATOR_KLEENE_HPP
+#define IRIS_ZZ_X4_OPERATOR_KLEENE_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/operator/list.hpp b/include/iris/x4/operator/list.hpp
index 1fc2589ab..9270aa6d7 100644
--- a/include/iris/x4/operator/list.hpp
+++ b/include/iris/x4/operator/list.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_OPERATOR_LIST_HPP
-#define IRIS_X4_OPERATOR_LIST_HPP
+#ifndef IRIS_ZZ_X4_OPERATOR_LIST_HPP
+#define IRIS_ZZ_X4_OPERATOR_LIST_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/operator/not_predicate.hpp b/include/iris/x4/operator/not_predicate.hpp
index 9da65fc17..fd9bcb10f 100644
--- a/include/iris/x4/operator/not_predicate.hpp
+++ b/include/iris/x4/operator/not_predicate.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_OPERATOR_NOT_PREDICATE_HPP
-#define IRIS_X4_OPERATOR_NOT_PREDICATE_HPP
+#ifndef IRIS_ZZ_X4_OPERATOR_NOT_PREDICATE_HPP
+#define IRIS_ZZ_X4_OPERATOR_NOT_PREDICATE_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/operator/optional.hpp b/include/iris/x4/operator/optional.hpp
index 946b3e2f5..a259a33fa 100644
--- a/include/iris/x4/operator/optional.hpp
+++ b/include/iris/x4/operator/optional.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_OPERATOR_OPTIONAL_HPP
-#define IRIS_X4_OPERATOR_OPTIONAL_HPP
+#ifndef IRIS_ZZ_X4_OPERATOR_OPTIONAL_HPP
+#define IRIS_ZZ_X4_OPERATOR_OPTIONAL_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/operator/plus.hpp b/include/iris/x4/operator/plus.hpp
index c512a2364..45f1ce0e9 100644
--- a/include/iris/x4/operator/plus.hpp
+++ b/include/iris/x4/operator/plus.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_OPERATOR_PLUS_HPP
-#define IRIS_X4_OPERATOR_PLUS_HPP
+#ifndef IRIS_ZZ_X4_OPERATOR_PLUS_HPP
+#define IRIS_ZZ_X4_OPERATOR_PLUS_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/operator/sequence.hpp b/include/iris/x4/operator/sequence.hpp
index 74a7aaea3..3b9b91b90 100644
--- a/include/iris/x4/operator/sequence.hpp
+++ b/include/iris/x4/operator/sequence.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_OPERATOR_SEQUENCE_HPP
-#define IRIS_X4_OPERATOR_SEQUENCE_HPP
+#ifndef IRIS_ZZ_X4_OPERATOR_SEQUENCE_HPP
+#define IRIS_ZZ_X4_OPERATOR_SEQUENCE_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/parse.hpp b/include/iris/x4/parse.hpp
index a1a07805a..0b41c91f7 100644
--- a/include/iris/x4/parse.hpp
+++ b/include/iris/x4/parse.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_PARSE_HPP
-#define IRIS_X4_PARSE_HPP
+#ifndef IRIS_ZZ_X4_PARSE_HPP
+#define IRIS_ZZ_X4_PARSE_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/parse_result.hpp b/include/iris/x4/parse_result.hpp
index 3ed317a97..480988e4a 100644
--- a/include/iris/x4/parse_result.hpp
+++ b/include/iris/x4/parse_result.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_PARSE_RESULT_HPP
-#define IRIS_X4_PARSE_RESULT_HPP
+#ifndef IRIS_ZZ_X4_PARSE_RESULT_HPP
+#define IRIS_ZZ_X4_PARSE_RESULT_HPP
 
 /*=============================================================================
     Copyright (c) 2025 Nana Sakisaka
diff --git a/include/iris/x4/rule.hpp b/include/iris/x4/rule.hpp
index 2f58af834..b2c22fc06 100644
--- a/include/iris/x4/rule.hpp
+++ b/include/iris/x4/rule.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_RULE_HPP
-#define IRIS_X4_RULE_HPP
+#ifndef IRIS_ZZ_X4_RULE_HPP
+#define IRIS_ZZ_X4_RULE_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/string.hpp b/include/iris/x4/string.hpp
index 79019dd75..35bb8b486 100644
--- a/include/iris/x4/string.hpp
+++ b/include/iris/x4/string.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_STRING_HPP
-#define IRIS_X4_STRING_HPP
+#ifndef IRIS_ZZ_X4_STRING_HPP
+#define IRIS_ZZ_X4_STRING_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/string/case_compare.hpp b/include/iris/x4/string/case_compare.hpp
index aeb48f4d0..e9ace45df 100644
--- a/include/iris/x4/string/case_compare.hpp
+++ b/include/iris/x4/string/case_compare.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_STRING_CASE_COMPARE_HPP
-#define IRIS_X4_STRING_CASE_COMPARE_HPP
+#ifndef IRIS_ZZ_X4_STRING_CASE_COMPARE_HPP
+#define IRIS_ZZ_X4_STRING_CASE_COMPARE_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/string/detail/string_parse.hpp b/include/iris/x4/string/detail/string_parse.hpp
index 120a03ddd..c027248d0 100644
--- a/include/iris/x4/string/detail/string_parse.hpp
+++ b/include/iris/x4/string/detail/string_parse.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_STRING_DETAIL_STRING_PARSE_HPP
-#define IRIS_X4_STRING_DETAIL_STRING_PARSE_HPP
+#ifndef IRIS_ZZ_X4_STRING_DETAIL_STRING_PARSE_HPP
+#define IRIS_ZZ_X4_STRING_DETAIL_STRING_PARSE_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/string/detail/tst_node.hpp b/include/iris/x4/string/detail/tst_node.hpp
index d82864a64..c4adf79f3 100644
--- a/include/iris/x4/string/detail/tst_node.hpp
+++ b/include/iris/x4/string/detail/tst_node.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_STRING_DETAIL_TST_NODE_HPP
-#define IRIS_X4_STRING_DETAIL_TST_NODE_HPP
+#ifndef IRIS_ZZ_X4_STRING_DETAIL_TST_NODE_HPP
+#define IRIS_ZZ_X4_STRING_DETAIL_TST_NODE_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/string/literal_string.hpp b/include/iris/x4/string/literal_string.hpp
index 51f5446da..848e5ed7a 100644
--- a/include/iris/x4/string/literal_string.hpp
+++ b/include/iris/x4/string/literal_string.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_STRING_LITERAL_STRING_HPP
-#define IRIS_X4_STRING_LITERAL_STRING_HPP
+#ifndef IRIS_ZZ_X4_STRING_LITERAL_STRING_HPP
+#define IRIS_ZZ_X4_STRING_LITERAL_STRING_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/string/string.hpp b/include/iris/x4/string/string.hpp
index 540aaff44..4ea10a291 100644
--- a/include/iris/x4/string/string.hpp
+++ b/include/iris/x4/string/string.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_STRING_STRING_HPP
-#define IRIS_X4_STRING_STRING_HPP
+#ifndef IRIS_ZZ_X4_STRING_STRING_HPP
+#define IRIS_ZZ_X4_STRING_STRING_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/string/tst.hpp b/include/iris/x4/string/tst.hpp
index 38df327e0..22878302a 100644
--- a/include/iris/x4/string/tst.hpp
+++ b/include/iris/x4/string/tst.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_STRING_TST_HPP
-#define IRIS_X4_STRING_TST_HPP
+#ifndef IRIS_ZZ_X4_STRING_TST_HPP
+#define IRIS_ZZ_X4_STRING_TST_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/string/utf8.hpp b/include/iris/x4/string/utf8.hpp
index 034e6b535..2dc5d3bb0 100644
--- a/include/iris/x4/string/utf8.hpp
+++ b/include/iris/x4/string/utf8.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_STRING_UTF8_HPP
-#define IRIS_X4_STRING_UTF8_HPP
+#ifndef IRIS_ZZ_X4_STRING_UTF8_HPP
+#define IRIS_ZZ_X4_STRING_UTF8_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/symbols.hpp b/include/iris/x4/symbols.hpp
index 49a3f95f0..d5a3e4b85 100644
--- a/include/iris/x4/symbols.hpp
+++ b/include/iris/x4/symbols.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_SYMBOLS_HPP
-#define IRIS_X4_SYMBOLS_HPP
+#ifndef IRIS_ZZ_X4_SYMBOLS_HPP
+#define IRIS_ZZ_X4_SYMBOLS_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/traits/attribute_category.hpp b/include/iris/x4/traits/attribute_category.hpp
index 5032b1ff8..aac482c69 100644
--- a/include/iris/x4/traits/attribute_category.hpp
+++ b/include/iris/x4/traits/attribute_category.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_TRAITS_ATTRIBUTE_CATEGORY_HPP
-#define IRIS_X4_TRAITS_ATTRIBUTE_CATEGORY_HPP
+#ifndef IRIS_ZZ_X4_TRAITS_ATTRIBUTE_CATEGORY_HPP
+#define IRIS_ZZ_X4_TRAITS_ATTRIBUTE_CATEGORY_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/traits/attribute_of_binary.hpp b/include/iris/x4/traits/attribute_of_binary.hpp
index 6e7b4a109..ffd60eb94 100644
--- a/include/iris/x4/traits/attribute_of_binary.hpp
+++ b/include/iris/x4/traits/attribute_of_binary.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_TRAITS_ATTRIBUTE_OF_BINARY_HPP
-#define IRIS_X4_TRAITS_ATTRIBUTE_OF_BINARY_HPP
+#ifndef IRIS_ZZ_X4_TRAITS_ATTRIBUTE_OF_BINARY_HPP
+#define IRIS_ZZ_X4_TRAITS_ATTRIBUTE_OF_BINARY_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
@@ -28,7 +28,7 @@ template<class TypeList, class... Us>
 struct append_to_type_list {};
 
 template<class TypeList, class... Us>
-using append_to_type_list_t = append_to_type_list<TypeList, Us...>::type; 
+using append_to_type_list_t = append_to_type_list<TypeList, Us...>::type;
 
 template<class... Ts>
 struct append_to_type_list<type_list<Ts...>>
diff --git a/include/iris/x4/traits/char_encoding_traits.hpp b/include/iris/x4/traits/char_encoding_traits.hpp
index 43596e5cf..ff14fe981 100644
--- a/include/iris/x4/traits/char_encoding_traits.hpp
+++ b/include/iris/x4/traits/char_encoding_traits.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_TRAITS_CHAR_ENCODING_TRAITS_HPP
-#define IRIS_X4_TRAITS_CHAR_ENCODING_TRAITS_HPP
+#ifndef IRIS_ZZ_X4_TRAITS_CHAR_ENCODING_TRAITS_HPP
+#define IRIS_ZZ_X4_TRAITS_CHAR_ENCODING_TRAITS_HPP
 
 /*=============================================================================
     Copyright (c) 2025 Nana Sakisaka
diff --git a/include/iris/x4/traits/container_traits.hpp b/include/iris/x4/traits/container_traits.hpp
index f1caa9ff2..b768b1fc5 100644
--- a/include/iris/x4/traits/container_traits.hpp
+++ b/include/iris/x4/traits/container_traits.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_TRAITS_CONTAINER_TRAITS_HPP
-#define IRIS_X4_TRAITS_CONTAINER_TRAITS_HPP
+#ifndef IRIS_ZZ_X4_TRAITS_CONTAINER_TRAITS_HPP
+#define IRIS_ZZ_X4_TRAITS_CONTAINER_TRAITS_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/traits/numeric_traits.hpp b/include/iris/x4/traits/numeric_traits.hpp
index a7844b74a..3f624a160 100644
--- a/include/iris/x4/traits/numeric_traits.hpp
+++ b/include/iris/x4/traits/numeric_traits.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_TRAITS_NUMERIC_TRAITS_HPP
-#define IRIS_X4_TRAITS_NUMERIC_TRAITS_HPP
+#ifndef IRIS_ZZ_X4_TRAITS_NUMERIC_TRAITS_HPP
+#define IRIS_ZZ_X4_TRAITS_NUMERIC_TRAITS_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2011 Hartmut Kaiser
diff --git a/include/iris/x4/traits/optional_traits.hpp b/include/iris/x4/traits/optional_traits.hpp
index 7735778ef..036798150 100644
--- a/include/iris/x4/traits/optional_traits.hpp
+++ b/include/iris/x4/traits/optional_traits.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_TRAITS_OPTIONAL_TRAITS_HPP
-#define IRIS_X4_TRAITS_OPTIONAL_TRAITS_HPP
+#ifndef IRIS_ZZ_X4_TRAITS_OPTIONAL_TRAITS_HPP
+#define IRIS_ZZ_X4_TRAITS_OPTIONAL_TRAITS_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/traits/string_traits.hpp b/include/iris/x4/traits/string_traits.hpp
index 0cc711e4a..639741877 100644
--- a/include/iris/x4/traits/string_traits.hpp
+++ b/include/iris/x4/traits/string_traits.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_TRAITS_STRING_TRAITS_HPP
-#define IRIS_X4_TRAITS_STRING_TRAITS_HPP
+#ifndef IRIS_ZZ_X4_TRAITS_STRING_TRAITS_HPP
+#define IRIS_ZZ_X4_TRAITS_STRING_TRAITS_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/traits/subrange_traits.hpp b/include/iris/x4/traits/subrange_traits.hpp
index f57439b97..70422b1f7 100644
--- a/include/iris/x4/traits/subrange_traits.hpp
+++ b/include/iris/x4/traits/subrange_traits.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_TRAITS_SUBRANGE_TRAITS_HPP
-#define IRIS_X4_TRAITS_SUBRANGE_TRAITS_HPP
+#ifndef IRIS_ZZ_X4_TRAITS_SUBRANGE_TRAITS_HPP
+#define IRIS_ZZ_X4_TRAITS_SUBRANGE_TRAITS_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/traits/substitution.hpp b/include/iris/x4/traits/substitution.hpp
index 896e12fcf..d8c04a51d 100644
--- a/include/iris/x4/traits/substitution.hpp
+++ b/include/iris/x4/traits/substitution.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_TRAITS_SUBSTITUTION_HPP
-#define IRIS_X4_TRAITS_SUBSTITUTION_HPP
+#ifndef IRIS_ZZ_X4_TRAITS_SUBSTITUTION_HPP
+#define IRIS_ZZ_X4_TRAITS_SUBSTITUTION_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/traits/transform_attribute.hpp b/include/iris/x4/traits/transform_attribute.hpp
index 450dac785..6afa29a36 100644
--- a/include/iris/x4/traits/transform_attribute.hpp
+++ b/include/iris/x4/traits/transform_attribute.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_TRAITS_TRANSFORM_ATTRIBUTE_HPP
-#define IRIS_X4_TRAITS_TRANSFORM_ATTRIBUTE_HPP
+#ifndef IRIS_ZZ_X4_TRAITS_TRANSFORM_ATTRIBUTE_HPP
+#define IRIS_ZZ_X4_TRAITS_TRANSFORM_ATTRIBUTE_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/traits/tuple_traits.hpp b/include/iris/x4/traits/tuple_traits.hpp
index 5f7810621..0771aa886 100644
--- a/include/iris/x4/traits/tuple_traits.hpp
+++ b/include/iris/x4/traits/tuple_traits.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_TRAITS_TUPLE_TRAITS_HPP
-#define IRIS_X4_TRAITS_TUPLE_TRAITS_HPP
+#ifndef IRIS_ZZ_X4_TRAITS_TUPLE_TRAITS_HPP
+#define IRIS_ZZ_X4_TRAITS_TUPLE_TRAITS_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/include/iris/x4/traits/variant_traits.hpp b/include/iris/x4/traits/variant_traits.hpp
index 38615ee32..34203ab6f 100644
--- a/include/iris/x4/traits/variant_traits.hpp
+++ b/include/iris/x4/traits/variant_traits.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_TRAITS_VARIANT_TRAITS_HPP
-#define IRIS_X4_TRAITS_VARIANT_TRAITS_HPP
+#ifndef IRIS_ZZ_X4_TRAITS_VARIANT_TRAITS_HPP
+#define IRIS_ZZ_X4_TRAITS_VARIANT_TRAITS_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2014 Joel de Guzman
diff --git a/modules/iris b/modules/iris
index 93187f669..32d9fd929 160000
--- a/modules/iris
+++ b/modules/iris
@@ -1 +1 @@
-Subproject commit 93187f66978325083246a5a7773cef3fa8a356ef
+Subproject commit 32d9fd9299bff648b9852b1bb822f2c53cbd62f2
diff --git a/test/x4/grammar.hpp b/test/x4/grammar.hpp
index 0df783f53..400133cb7 100644
--- a/test/x4/grammar.hpp
+++ b/test/x4/grammar.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_TEST_X4_GRAMMAR_HPP
-#define IRIS_X4_TEST_X4_GRAMMAR_HPP
+#ifndef IRIS_ZZ_X4_TEST_X4_GRAMMAR_HPP
+#define IRIS_ZZ_X4_TEST_X4_GRAMMAR_HPP
 
 /*=============================================================================
     Copyright (c) 2019 Joel de Guzman
diff --git a/test/x4/iris_x4_test.hpp b/test/x4/iris_x4_test.hpp
index 45d6dbd4b..d5bbb77a2 100644
--- a/test/x4/iris_x4_test.hpp
+++ b/test/x4/iris_x4_test.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_TEST_IRIS_X4_TEST_HPP
-#define IRIS_X4_TEST_IRIS_X4_TEST_HPP
+#ifndef IRIS_ZZ_X4_TEST_IRIS_X4_TEST_HPP
+#define IRIS_ZZ_X4_TEST_IRIS_X4_TEST_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2013 Joel de Guzman
diff --git a/test/x4/pch.hpp b/test/x4/pch.hpp
index 20c4fba06..59ac0c37d 100644
--- a/test/x4/pch.hpp
+++ b/test/x4/pch.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_TEST_PCH_HPP
-#define IRIS_X4_TEST_PCH_HPP
+#ifndef IRIS_ZZ_X4_TEST_PCH_HPP
+#define IRIS_ZZ_X4_TEST_PCH_HPP
 
 #include <iris/alloy/tuple.hpp>
 #include <iris/alloy/adapt.hpp>
diff --git a/test/x4/real.hpp b/test/x4/real.hpp
index fc2e2e6b2..cf0cc7128 100644
--- a/test/x4/real.hpp
+++ b/test/x4/real.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_TEST_X4_REAL_HPP
-#define IRIS_X4_TEST_X4_REAL_HPP
+#ifndef IRIS_ZZ_X4_TEST_X4_REAL_HPP
+#define IRIS_ZZ_X4_TEST_X4_REAL_HPP
 
 /*=============================================================================
     Copyright (c) 2001-2010 Joel de Guzman
diff --git a/test/x4/rule_separate_tu_grammar.hpp b/test/x4/rule_separate_tu_grammar.hpp
index 2641cf3f8..580d30f24 100644
--- a/test/x4/rule_separate_tu_grammar.hpp
+++ b/test/x4/rule_separate_tu_grammar.hpp
@@ -1,5 +1,5 @@
-#ifndef IRIS_X4_TEST_X4_RULE_SEPARATE_TU_GRAMMAR_HPP
-#define IRIS_X4_TEST_X4_RULE_SEPARATE_TU_GRAMMAR_HPP
+#ifndef IRIS_ZZ_X4_TEST_X4_RULE_SEPARATE_TU_GRAMMAR_HPP
+#define IRIS_ZZ_X4_TEST_X4_RULE_SEPARATE_TU_GRAMMAR_HPP
 
 /*=============================================================================
     Copyright (c) 2019 Nikita Kniazev