∀ {k G A : Type u} [inst : CommRing k] [inst_1 : Group G] [inst_2 : AddCommGroup A] [inst_3 : Module k A]
  [inst_4 : DistribMulAction G A] [inst_5 : SMulCommClass G k A],
  ∀ f ∈ groupCohomology.coboundaries₂ (Rep.ofDistribMulAction k G A), groupCohomology.IsCoboundary₂ f