lapse
# Seconds since the last call to `lapse`
fun lapse: Float
do
var time_at_last_lapse = time_at_last_lapse
var now = temp
now.update
time_at_last_lapse.minus(now, time_at_last_lapse)
var r = time_at_last_lapse.to_f
self.temp = time_at_last_lapse
self.time_at_last_lapse = now
return r
end
lib/realtime/realtime.nit:204,2--217,4