traceTo' worker tracer ((HistoryRunSyscall tid):rest) =
    do runSyscallWorker worker tid
       traceTo' worker tracer rest
traceTo' worker tracer ((HistoryRunSyscall tid):rest) =
    do runSyscallWorker worker tid
       traceTo' worker tracer rest
traceTo' worker tracer ((HistoryRunSyscall tid):rest) =
    do runSyscallWorker worker tid
       traceTo' worker tracer rest