Commit 52cdec56 authored by Jacques-Henri Jourdan's avatar Jacques-Henri Jourdan

Make Is_true a typeclass.

This makes the typeclass mechanism able to use instances like [Is_true X -> Blah], where X reduces to X.
parent 2509e6f8
......@@ -374,6 +374,8 @@ Notation zip := (zip_with pair).
Coercion Is_true : bool >-> Sortclass.
Hint Unfold Is_true.
Hint Immediate Is_true_eq_left.
Existing Class Is_true.
Instance true_Is_true : Is_true true := I.
Hint Resolve orb_prop_intro andb_prop_intro.
Notation "(&&)" := andb (only parsing).
Notation "(||)" := orb (only parsing).
......@@ -146,7 +146,7 @@ Proof. apply dsig_eq; reflexivity. Qed.
Instance True_dec: Decision True := left I.
Instance False_dec: Decision False := right (False_rect False).
Instance Is_true_dec b : Decision (Is_true b).
Proof. destruct b; apply _. Defined.
Proof. destruct b; simpl; apply _. Defined.
Section prop_dec.
Context `(P_dec : Decision P) `(Q_dec : Decision Q).
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