assumption
case timer.timer.timer.timer
net✝ : Network
exec : Executable net✝
a✝¹ : ReactorId net✝
reaction : Class.Reaction (Path.class a✝¹)
t✝ : reaction.val.timers
a✝ :
  (Executable.timer exec
        { reactor := a✝¹, timer := (_ : reaction.val.timers = timers (Path.class a✝¹)) ▸ t✝ }).isFiring =
    true
⊢ (Reactor.timer (reactors exec a✝¹) ((_ : reaction.val.timers = timers (Path.class a✝¹)) ▸ t✝)).isFiring = true
no goals