https://git.ruby-lang.org/ruby.git/commit/?id=672213ef1c

From 672213ef1ca2b71312084057e27580b340438796 Mon Sep 17 00:00:00 2001
From: "Chelsea Corvus (Battell)" <chelsea.battell@g...>
Date: Tue, 25 Feb 2020 13:43:17 -0500
Subject: Document that Array#index and find_index are aliases [ci skip]


diff --git a/array.c b/array.c
index c1f8071..d5650cf 100644
--- a/array.c
+++ b/array.c
@@ -1774,6 +1774,8 @@ rb_ary_fetch(int argc, VALUE *argv, VALUE ary) https://github.com/ruby/ruby/blob/trunk/array.c#L1774
  *     a.index("b")              #=> 1
  *     a.index("z")              #=> nil
  *     a.index {|x| x == "b"}    #=> 1
+ *
+ *  Array#index is an alias for Array#find_index.
  */
 
 static VALUE
-- 
cgit v0.10.2


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