fact: Definition extendable_const_isconnected_inO (n : nat) (A : Type) `{IsConnected O A} (C : Type) `{In O C} : ExtendableAlong n (const_tt A) (fun _ => C).
imports: HoTT.Basics HoTT.Types Equiv.BiInv Extensions HProp HFiber NullHomotopy Limits.Pullback PathAny Colimits.Pushout