∀ {M : Type u_1} {N : Type u_2} (α : Type u_3) [inst : Monoid M] [inst_1 : MulAction M α] [inst_2 : Monoid N]
  (g : N →* M), MulAction.compHom α g = { smul := SMul.comp.smul ⇑g, mul_smul := ⋯, one_smul := ⋯ }