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(** * Reflect: a specialized inductive type for relating propositions and booleans, as popularized by the Ssreflect library.    *)
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Notation ReflectT := Datatypes.ReflectT (only parsing).
Notation ReflectF := Datatypes.ReflectF (only parsing).
(** Interest: a case on a reflect lemma or hyp performs clever unification, and leave the goal in a convenient shape (a bit like case_eq). *)
(** Relation with iff : *)

Lemma iff_reflect : forall P b, (P<->b=true) -> reflect P b.