fact: Definition make_double_associator {C : category} {D : twosided_disp_cat C C} {Cm : hor_comp D} (a : double_associator_data Cm) (Ha : double_associator_laws a) : double_cat_associator Cm := a ,, Ha.
imports: UniMath.Foundations.All UniMath.MoreFoundations.All UniMath.CategoryTheory.Core.Categories UniMath.CategoryTheory.Core.Isos UniMath.CategoryTheory.TwoSidedDisplayedCats.TwoSidedDispCat UniMath.CategoryTheory.TwoSidedDisplayedCats.Isos