https://git.ruby-lang.org/ruby.git/commit/?id=8dab71b9d0

From 8dab71b9d0e9d2054dfb8d703656d4e6712a9efd Mon Sep 17 00:00:00 2001
From: Nobuyoshi Nakada <nobu@r...>
Date: Wed, 26 Feb 2020 12:43:53 +0900
Subject: Simplified single script case

Simply use `File.basename` to remove the directory name (and
suffix), instead of `gsub` which can replace unintended parts.

diff --git a/tool/rbinstall.rb b/tool/rbinstall.rb
index 3333692..9cd9924 100755
--- a/tool/rbinstall.rb
+++ b/tool/rbinstall.rb
@@ -675,7 +675,7 @@ module RbInstall https://github.com/ruby/ruby/blob/trunk/tool/rbinstall.rb#L675
             remove_prefix(prefix, ruby_source)
           end
         else
-          [remove_prefix(File.dirname(@gemspec) + '/', @gemspec.gsub(/gemspec/, 'rb'))]
+          [File.basename(@gemspec, '.gemspec') + '.rb']
         end
       end
 
-- 
cgit v0.10.2


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