https://git.ruby-lang.org/ruby.git/commit/?id=ada2f71c70

From ada2f71c70bb11f1d71485e2090ce36872608217 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E5=8D=9C=E9=83=A8=E6=98=8C=E5=B9=B3?=
 <shyouhei@r...>
Date: Sat, 7 Mar 2020 18:58:58 +0900
Subject: rb_check_safe_obj no longer exists

Commit e91c39f1c0f7d5e670266d9593d533fd444957f6 deleted definition of it.
Though I'm not sure if we can delete public API like this, it no longer
works nontheless.  Having declaration without definiton is worse than
having nothing at all.  Just delete the declartion too.

diff --git a/include/ruby/ruby.h b/include/ruby/ruby.h
index b6d1e54..b835bd6 100644
--- a/include/ruby/ruby.h
+++ b/include/ruby/ruby.h
@@ -603,7 +603,6 @@ char *rb_string_value_cstr(volatile VALUE*); https://github.com/ruby/ruby/blob/trunk/include/ruby/ruby.h#L603
 #define StringValuePtr(v) rb_string_value_ptr(&(v))
 #define StringValueCStr(v) rb_string_value_cstr(&(v))
 
-void rb_check_safe_obj(VALUE);
 #define SafeStringValue(v) StringValue(v)
 #if GCC_VERSION_SINCE(4,4,0)
 void rb_check_safe_str(VALUE) __attribute__((error("rb_check_safe_str() and Check_SafeStr() are obsolete; use StringValue() instead")));
-- 
cgit v0.10.2


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