$version Yosys $end
$scope module undriven_replay $end
$var wire 1 ! in $end
$var wire 1 " out $end
$var wire 1 # undrv $end
$upscope $end
$enddefinitions $end
#0
b0 !
b0 "
b1 #
#10
b1 !
b1 "
b0 #