https://git.ruby-lang.org/ruby.git/commit/?id=454b4da763

From 454b4da7635b6322e85fd38735d9a04963644c4b Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 8 Dec 2021 17:59:16 +0900
Subject: [DOC] Integer.try_convert [ci skip]

---
 numeric.c  |  1 +
 numeric.rb | 19 +++++++++++++++++++
 2 files changed, 20 insertions(+)

diff --git a/numeric.c b/numeric.c
index 28b68a71fbd..d6fe05d8e81 100644
--- a/numeric.c
+++ b/numeric.c
@@ -5991,6 +5991,7 @@ rb_int_s_isqrt(VALUE self, VALUE num) https://github.com/ruby/ruby/blob/trunk/numeric.c#L5991
     }
 }
 
+/* :nodoc: */
 static VALUE
 int_s_try_convert(VALUE self, VALUE num)
 {
diff --git a/numeric.rb b/numeric.rb
index 08b31ac3076..d48a4ee336b 100644
--- a/numeric.rb
+++ b/numeric.rb
@@ -229,6 +229,25 @@ class Integer https://github.com/ruby/ruby/blob/trunk/numeric.rb#L229
   end
 end
 
+#  call-seq:
+#    Integer.try_convert(object) -> object, integer, or nil
+#
+#  If +object+ is an \Integer object, returns +object+.
+#
+#  Otherwise if +object+ responds to <tt>:to_int</tt>,
+#  calls <tt>object.to_int</tt> and returns the result.
+#
+#  Returns +nil+ if +object+ does not respond to <tt>:to_ary</tt>
+#
+#  Raises an exception unless <tt>object.to_int</tt> returns an \Integer object.
+#
+def Integer.try_convert(num)
+=begin
+  Primitive.attr! 'inline'
+  Primitive.cexpr! 'rb_check_integer_type(num)'
+=end
+end if false
+
 class Float
   #
   # call-seq:
-- 
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