[ruby-cvs:78317] 745ab16818 (master): Disable tracer ext of IRB when tracer doesn't found

"aycabta" <[email protected]>
Newsgroups gmane.comp.lang.ruby.cvs
Message-ID <[email protected]> 
aycabta	2019-11-24 22:42:08 +0900 (Sun, 24 Nov 2019)

  New Revision: 745ab16818

  https://github.com/ruby/ruby/commit/745ab16818

  Log:
    Disable tracer ext of IRB when tracer doesn't found

  Modified files:
    lib/irb/ext/tracer.rb
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