https://git.ruby-lang.org/ruby.git/commit/?id=fb568fe724

From fb568fe724b0c8b2582263ed859ad10f0bd90d38 Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Tue, 28 May 2019 23:46:07 +0900
Subject: Added missing predicate macros


diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index 86e01f6..e698142 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -2295,6 +2295,9 @@ static inline int rb_toupper(int c) { return rb_islower(c) ? (c&0x5f) : c; } https://github.com/ruby/ruby/blob/trunk/include/ruby/ruby.h#L2295
 #define ISALPHA(c) rb_isalpha(c)
 #define ISDIGIT(c) rb_isdigit(c)
 #define ISXDIGIT(c) rb_isxdigit(c)
+#define ISBLANK(c) rb_isblank(c)
+#define ISCNTRL(c) rb_iscntrl(c)
+#define ISPUNCT(c) rb_ispunct(c)
 #endif
 #define TOUPPER(c) rb_toupper(c)
 #define TOLOWER(c) rb_tolower(c)
-- 
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