https://git.ruby-lang.org/ruby.git/commit/?id=221ba9b66c

From 221ba9b66c022a99227de8bf21db618666e17c42 Mon Sep 17 00:00:00 2001
From: Hiroshi SHIBATA <hsbt@r...>
Date: Sat, 17 Aug 2019 17:01:19 +0900
Subject: Revert "`Gem.load_path_insert_index always returns non-nil index
 after Ruby 1.9"

This reverts commit 260ef51a73c067599826c8ab110c53994c1b6226.

  This broke the stable versions of Ruby like 2.4 and 2.5

diff --git a/lib/rubygems/core_ext/kernel_require.rb b/lib/rubygems/core_ext/kernel_require.rb
index b4aebf8..5516933 100755
--- a/lib/rubygems/core_ext/kernel_require.rb
+++ b/lib/rubygems/core_ext/kernel_require.rb
@@ -40,7 +40,7 @@ module Kernel https://github.com/ruby/ruby/blob/trunk/lib/rubygems/core_ext/kernel_require.rb#L40
     # https://github.com/rubygems/rubygems/pull/1868
     resolved_path = begin
       rp = nil
-      $LOAD_PATH[0...Gem.load_path_insert_index].each do |lp|
+      $LOAD_PATH[0...Gem.load_path_insert_index || -1].each do |lp|
         safe_lp = lp.dup.untaint
         next if File.symlink? safe_lp # for backword compatibility
         Gem.suffixes.each do |s|
-- 
cgit v0.10.2


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