[ruby-cvs:71535] nagachika:r64443 (ruby_2_5): merge revision(s) 62099: [Backport #14416]

[nagachika at ruby-lang.org]

nagachika	2018-08-18 17:35:42 +0900 (Sat, 18 Aug 2018)

  New Revision: 64443

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=64443

  Log:
    merge revision(s) 62099: [Backport #14416]
    
    net/pop: make modified strings mutable
    
    Thanks to Michael Zimmerman for the bug report
    
    * lib/net/pop.rb: make modified strings mutable
      [ruby-core:85210] [Bug #14416]
    * test/net/pop/test_pop.rb: new test

  Modified directories:
    branches/ruby_2_5/
  Modified files:
    branches/ruby_2_5/lib/net/pop.rb
    branches/ruby_2_5/test/net/pop/test_pop.rb
    branches/ruby_2_5/version.h