.diff

--- lib/ruby/stdlib/fileutils.rb	2022-04-20 14:27:30.000000000 -0500
+++ ../ruby/lib/fileutils.rb	2022-03-26 16:46:17.000000000 -0500
@@ -201,35 +201,28 @@
   # * /usr/local/lib
   # * /usr/local/lib/ruby
   #
   # You can pass several directories at a time in a list.
   #
   def mkdir_p(list, mode: nil, noop: nil, verbose: nil)
     list = fu_list(list)
     fu_output_message "mkdir -p #{mode ? ('-m %03o ' % mode) : ''}#{list.join ' '}" if verbose
     return *list if noop
 
-    list.map {|path| remove_trailing_slash(path)}.each do |path|
-      # optimize for the most common case
-      begin
-        fu_mkdir path, mode
-        next
-      rescue SystemCallError
-        next if File.directory?(path)
-      end
+    list.each do |item|
+      path = remove_trailing_slash(item)
 
       stack = []
-      until path == stack.last   # dirname("/")=="/", dirname("C:/")=="C:/"
+      until File.directory?(path)
         stack.push path
         path = File.dirname(path)
       end
-      stack.pop                 # root directory should exist
       stack.reverse_each do |dir|
         begin
           fu_mkdir dir, mode
         rescue SystemCallError
           raise unless File.directory?(dir)
         end
       end
     end
 
     return *list