https://git.ruby-lang.org/ruby.git/commit/?id=611da9faef

From 611da9faef76777e57718cf5b0286b965879479c Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Thu, 12 Aug 2021 10:42:33 +0900
Subject: Mark `rb_unexpected_type` as "cold" [Bug #18062]

So that it will not interfere the fast path in `Check_Type`.
---
 include/ruby/internal/error.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/ruby/internal/error.h b/include/ruby/internal/error.h
index 7e9d5c4..bd5c4d2 100644
--- a/include/ruby/internal/error.h
+++ b/include/ruby/internal/error.h
@@ -61,7 +61,7 @@ NORETURN(void rb_syserr_fail_str(int, VALUE)); https://github.com/ruby/ruby/blob/trunk/include/ruby/internal/error.h#L61
 NORETURN(void rb_mod_syserr_fail(VALUE, int, const char*));
 NORETURN(void rb_mod_syserr_fail_str(VALUE, int, VALUE));
 NORETURN(void rb_readwrite_syserr_fail(enum rb_io_wait_readwrite, int, const char*));
-NORETURN(void rb_unexpected_type(VALUE,int));
+COLDFUNC NORETURN(void rb_unexpected_type(VALUE,int));
 
 VALUE *rb_ruby_verbose_ptr(void);
 VALUE *rb_ruby_debug_ptr(void);
-- 
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