Timings for Nameless.v
Require Import Basics.Overture.
(** * Building blocks for a globally nameless style of tactic reasoning *)
(** ** [hyp] returns any hypothesis, with subsequent failures backtracking through all hypotheses *)
Ltac hyp := multimatch goal with H : _ |- _ => constr:(H) end.
(** ** [enforce foo] ensures that [foo] is well-typed *)
Tactic Notation "enforce" open_constr(term) := idtac.
(** ** [syntax_enforce [ H := body ]] ensures that [H] has a body which is syntactically equal to [body] *)
Tactic Notation "syntax_enforce" "[" constr(H) ":=" open_constr(body) "]" := let H' := (eval unfold H in H) in constr_eq H' body.
(** ** [enforce [ x = y ]] ensures that two terms, possibly containing holes, are judgmentally equal *)
Tactic Notation "enforce" "[" open_constr(x) "=" open_constr(y) "]" := unify x y.
Goal Empty -> let X0 := tt in Empty -> Unit.
let H := hyp in
enforce (H : Unit);
syntax_enforce [ H := tt ];
enforce [ H = _ ];
enforce [ _ = H ];
enforce [ H = tt ].