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diff --git a/include/ruby/3/intern/error.h b/include/ruby/3/intern/error.h
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+/** \noop-*-C++-*-vi:ft=cpp
+ * @file
+ * @author Ruby developers <ruby-core@ruby-lang.org>
+ * @copyright This file is a part of the programming language Ruby.
+ * Permission is hereby granted, to either redistribute and/or
+ * modify this file, provided that the conditions mentioned in the
+ * file COPYING are met. Consult the file for details.
+ * @warning Symbols prefixed with either `RUBY3` or `ruby3` are
+ * implementation details. Don't take them as canon. They could
+ * rapidly appear then vanish. The name (path) of this header file
+ * is also an implementation detail. Do not expect it to persist
+ * at the place it is now. Developers are free to move it anywhere
+ * anytime at will.
+ * @note To ruby-core: remember that this header can be possibly
+ * recursively included from extension libraries written in C++.
+ * Do not expect for instance `__VA_ARGS__` is always available.
+ * We assume C99 for ruby itself but we don't assume languages of
+ * extension libraries. They could be written in C++98.
+ * @brief Public APIs related to ::rb_eException.
+ */
+#ifndef RUBY3_INTERN_ERROR_H
+#define RUBY3_INTERN_ERROR_H
+#include "ruby/3/dllexport.h"
+#include "ruby/3/value.h"
+#include "ruby/3/fl_type.h"
+#include "ruby/backward/2/assume.h"
+#include "ruby/backward/2/attributes.h"
+
+#define UNLIMITED_ARGUMENTS (-1)
+#define rb_exc_new2 rb_exc_new_cstr
+#define rb_exc_new3 rb_exc_new_str
+#define rb_check_trusted rb_check_trusted
+#define rb_check_trusted_inline rb_check_trusted
+#define rb_check_arity rb_check_arity
+
+RUBY3_SYMBOL_EXPORT_BEGIN()
+
+/* error.c */
+VALUE rb_exc_new(VALUE, const char*, long);
+VALUE rb_exc_new_cstr(VALUE, const char*);
+VALUE rb_exc_new_str(VALUE, VALUE);
+PRINTF_ARGS(NORETURN(void rb_loaderror(const char*, ...)), 1, 2);
+PRINTF_ARGS(NORETURN(void rb_loaderror_with_path(VALUE path, const char*, ...)), 2, 3);
+PRINTF_ARGS(NORETURN(void rb_name_error(ID, const char*, ...)), 2, 3);
+PRINTF_ARGS(NORETURN(void rb_name_error_str(VALUE, const char*, ...)), 2, 3);
+PRINTF_ARGS(NORETURN(void rb_frozen_error_raise(VALUE, const char*, ...)), 2, 3);
+NORETURN(void rb_invalid_str(const char*, const char*));
+NORETURN(void rb_error_frozen(const char*));
+NORETURN(void rb_error_frozen_object(VALUE));
+void rb_error_untrusted(VALUE);
+void rb_check_frozen(VALUE);
+void rb_check_trusted(VALUE);
+void rb_check_copyable(VALUE obj, VALUE orig);
+NORETURN(MJIT_STATIC void rb_error_arity(int, int, int));
+RUBY3_SYMBOL_EXPORT_END()
+
+/* Does anyone use this? Remain not deleted for compatibility. */
+#define rb_check_frozen_internal(obj) do { \
+ VALUE frozen_obj = (obj); \
+ if (RB_UNLIKELY(RB_OBJ_FROZEN(frozen_obj))) { \
+ rb_error_frozen_object(frozen_obj); \
+ } \
+ } while (0)
+
+static inline void
+rb_check_frozen_inline(VALUE obj)
+{
+ if (RB_UNLIKELY(RB_OBJ_FROZEN(obj))) {
+ rb_error_frozen_object(obj);
+ }
+}
+#define rb_check_frozen rb_check_frozen_inline
+
+static inline int
+rb_check_arity(int argc, int min, int max)
+{
+ if ((argc < min) || (max != UNLIMITED_ARGUMENTS && argc > max))
+ rb_error_arity(argc, min, max);
+ return argc;
+}
+
+#endif /* RUBY3_INTERN_ERROR_H */