FileUtils conflict in Ruby 2.5.1

[Sega100500]

Debian Linux 8.10 Jessie
ruby 2.5.1p57 (2018-03-29 revision 63029) [x86_64-linux]
rubygems-update (2.7.7)

Error log:

pp 8789 output: /home/ruby/.rbenv/versions/2.5.1/lib/ruby/2.5.0/fileutils.rb:90: warning: already initialized constant FileUtils::VERSION
App 8789 output: /home/ruby/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/fileutils-1.1.0/lib/fileutils.rb:92: warning: previous definition
 of VERSION was here
App 8789 output: /home/ruby/.rbenv/versions/2.5.1/lib/ruby/2.5.0/fileutils.rb:1188: warning: already initialized constant FileUtils::Entry_:
:S_IF_DOOR
App 8789 output: /home/ruby/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/fileutils-1.1.0/lib/fileutils.rb:1267: warning: previous definiti
on of S_IF_DOOR was here
App 8789 output: /home/ruby/.rbenv/versions/2.5.1/lib/ruby/2.5.0/fileutils.rb:1446: warning: already initialized constant FileUtils::Entry_:
:DIRECTORY_TERM
App 8789 output: /home/ruby/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/fileutils-1.1.0/lib/fileutils.rb:1541: warning: previous definiti
on of DIRECTORY_TERM was here
App 8789 output: /home/ruby/.rbenv/versions/2.5.1/lib/ruby/2.5.0/fileutils.rb:1448: warning: already initialized constant FileUtils::Entry_:
:SYSCASE
App 8789 output: /home/ruby/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/fileutils-1.1.0/lib/fileutils.rb:1543: warning: previous definiti
on of SYSCASE was here
App 8789 output: /home/ruby/.rbenv/versions/2.5.1/lib/ruby/2.5.0/fileutils.rb:1501: warning: already initialized constant FileUtils::OPT_TAB
LE
App 8789 output: /home/ruby/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/fileutils-1.1.0/lib/fileutils.rb:1596: warning: previous definiti
on of OPT_TABLE was here
App 8789 output: /home/ruby/.rbenv/versions/2.5.1/lib/ruby/2.5.0/fileutils.rb:1555: warning: already initialized constant FileUtils::LOW_MET
HODS
App 8789 output: /home/ruby/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/fileutils-1.1.0/lib/fileutils.rb:1650: warning: previous definiti
on of LOW_METHODS was here
App 8789 output: /home/ruby/.rbenv/versions/2.5.1/lib/ruby/2.5.0/fileutils.rb:1562: warning: already initialized constant FileUtils::METHODS
App 8789 output: /home/ruby/.rbenv/versions/2.5.1/lib/ruby/gems/2.5.0/gems/fileutils-1.1.0/lib/fileutils.rb:1657: warning: previous definiti
on of METHODS was here

[hsbt]

Do not send the multi-post.

ref. ruby/fileutils#22