∀ {α : Type u_1} {β : Type u_2} {γ : Type u_3} [inst : TopologicalSpace α] [inst_1 : TopologicalSpace β]
  [inst_2 : TopologicalSpace γ] [inst_3 : Zero β] (g : C(β, γ)), g.comp 0 = ContinuousMap.const α (g 0)