have ⟨c, hm, _⟩ := h
t : Component.Valued × ID
tl : Output
hd : Change
h : t ∈ targets tl
⊢ t ∈ targets (hd :: tl)
t : Component.Valued × ID
tl : Output
hd : Change
h : t ∈ targets tl
c : Change
hm : c ∈ tl
right✝ : Change.Targets c t.1 t.2
⊢ t ∈ targets (hd :: tl)