[ruby-cvs:78289] eee70b41d4 (master): Add a warning message and --legacy of an alias of --singleline

"aycabta" <[email protected]>
Newsgroups gmane.comp.lang.ruby.cvs
Message-ID <[email protected]> 
aycabta	2019-11-21 02:44:15 +0900 (Thu, 21 Nov 2019)

  New Revision: eee70b41d4

  https://github.com/ruby/ruby/commit/eee70b41d4

  Log:
    Add a warning message and --legacy of an alias of --singleline

  Modified files:
    lib/irb/context.rb
    lib/irb/init.rb
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