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+Class by_transparent_abstract {T} (x : T) := make_by_transparent_abstract : T.
+Hint Extern 0 (@by_transparent_abstract ?T ?x) => change T; transparent_abstract exact_no_check x : typeclass_instances.
+
+Goal True /\ True.
+Proof.
+ split.
+ transparent_abstract exact I using foo.
+ let x := (eval hnf in foo) in constr_eq x I.
+ let x := constr:(ltac:(constructor) : True) in
+ let T := type of x in
+ let x := constr:(_ : by_transparent_abstract x) in
+ let x := (eval cbv delta [by_transparent_abstract] in (let y : T := x in y)) in
+ pose x as x'.
+ simpl in x'.
+ let v := eval cbv [x'] in x' in tryif constr_eq v I then fail 0 else idtac.
+ hnf in x'.
+ let v := eval cbv [x'] in x' in tryif constr_eq v I then idtac else fail 0.
+ exact x'.
+Defined.
+Check eq_refl : I = foo.
+Eval compute in foo.