https://git.ruby-lang.org/ruby.git/commit/?id=943f3e5fd4

From 943f3e5fd463bf2a4a3a4e92b5134e238b9c931d Mon Sep 17 00:00:00 2001
From: Koichi Sasada <ko1@a...>
Date: Mon, 9 Dec 2019 16:20:35 +0900
Subject: add include guard


diff --git a/builtin.h b/builtin.h
index a31d88b..0d2b13e 100644
--- a/builtin.h
+++ b/builtin.h
@@ -1,3 +1,6 @@ https://github.com/ruby/ruby/blob/trunk/builtin.h#L1
+#ifndef BUILTIN_H_INCLUDED
+#define BUILTIN_H_INCLUDED
+
 // invoke
 
 struct rb_builtin_function {
@@ -66,3 +69,5 @@ struct builtin_binary { https://github.com/ruby/ruby/blob/trunk/builtin.h#L69
     const unsigned char *bin;     // binary by ISeq#to_binary
     size_t bin_size;
 };
+
+#endif // BUILTIN_H_INCLUDED
-- 
cgit v0.10.2


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