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# File activesupport/lib/active_support/testing/isolation.rb, line 94 def run_in_isolation(&blk) read, write = IO.pipe pid = fork do read.close proxy = ProxyTestResult.new retval = yield proxy write.puts [Marshal.dump([retval, proxy])].pack("m") exit! end write.close result = read.read Process.wait2(pid) return result.unpack("m")[0] end