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-rw-r--r--include/ruby/3/arithmetic/mode_t.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/include/ruby/3/arithmetic/mode_t.h b/include/ruby/3/arithmetic/mode_t.h
index 54ccd376f8..ea6386305a 100644
--- a/include/ruby/3/arithmetic/mode_t.h
+++ b/include/ruby/3/arithmetic/mode_t.h
@@ -1,4 +1,6 @@
-/** \noop-*-C++-*-vi:ft=cpp
+#ifndef RUBY3_ARITHMETIC_MODE_T_H /*-*-C++-*-vi:se ft=cpp:*/
+#define RUBY3_ARITHMETIC_MODE_T_H
+/**
* @file
* @author Ruby developers <ruby-core@ruby-lang.org>
* @copyright This file is a part of the programming language Ruby.
@@ -28,3 +30,5 @@
#ifndef MODET2NUM
# define MODET2NUM RB_INT2NUM
#endif
+
+#endif /* RUBY3_ARITHMETIC_MODE_T_H */