hsbt	2018-06-20 16:16:25 +0900 (Wed, 20 Jun 2018)

  New Revision: 63700

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=63700

  Log:
    Thread is always provided at current ruby version.

  Modified files:
    trunk/lib/sync.rb
Index: lib/sync.rb
===================================================================
--- lib/sync.rb	(revision 63699)
+++ lib/sync.rb	(revision 63700)
@@ -38,10 +38,6 @@ https://github.com/ruby/ruby/blob/trunk/lib/sync.rb#L38
 #
 #
 
-unless defined? Thread
-  raise "Thread not available for this ruby interpreter"
-end
-
 ##
 # A module that provides a two-phase lock with a counter.
 

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