usa	2018-11-20 14:18:28 +0900 (Tue, 20 Nov 2018)

  New Revision: 65829

  https://svn.ruby-lang.org/cgi-bin/viewvc.cgi?view=revision&revision=65829

  Log:
    Simply treat IO::WaitReadable just like Errno::EAGAIN

  Modified files:
    trunk/bootstraptest/runner.rb
Index: bootstraptest/runner.rb
===================================================================
--- bootstraptest/runner.rb	(revision 65828)
+++ bootstraptest/runner.rb	(revision 65829)
@@ -383,15 +383,9 @@ def assert_finish(timeout_seconds, tests https://github.com/ruby/ruby/blob/trunk/bootstraptest/runner.rb#L383
       end
       if io.respond_to?(:read_nonblock)
         if IO.select([io], nil, nil, diff)
-          tries = 0
           begin
             io.read_nonblock(1024)
-          rescue IO::WaitReadable
-            IO.select([io])
-            tries += 1
-            break if tries > 3
-            retry
-          rescue Errno::EAGAIN, EOFError
+          rescue Errno::EAGAIN, IO::WaitReadable, EOFError
             break
           end while true
         end

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