case port h =>
  simp [portIsPresent, hp] at h
  exact h
net✝ : Network
exec : Executable net✝
reactor : ReactorId net✝
reaction : Class.Reaction (Path.class reactor)
p' : reaction.val.portSources.vars
loc input✝ : (Class.interface (Path.class reactor) Reactor.InterfaceKind.inputs).vars
hi : Interface.Subscheme.coe p' = Sum.inl input✝
hp : input✝ = loc
h : portIsPresent exec { reactor := reactor, port := input✝ } = true
⊢ ∃ v, interface exec reactor Reactor.InterfaceKind.inputs loc = some v
no goals