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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 reflect := Datatypes.reflect (only parsing).Notation ReflectT := Datatypes.ReflectT (only parsing).Notation ReflectF := Datatypes.ReflectF (only parsing).

Lemma eqb_spec (b b' : bool) : reflect (b = b') (eqb b b').