(x : X) : glue x pt = gluel' x pt. Proof. refine (_ @ concat_p1 _). apply whiskerL, concat_pV. Defined.
Require Import Basics.Overture Basics.PathGroupoids Basics.Tactics Basics.Equivalences. Require Import Types.Sum Types.Bool Types.Paths Types.Forall. Require Import WildCat.Core WildCat.Bifunctor WildCat.Equiv. Require Import Colimits.Pushout. Require Import Cubical.DPath. Require Import Pointed.Core.