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Require Import ZArith ssreflect ssrfun.
From HB Require Import structures.
HB.mixin Record is_semigroup (S : Type) := {
add : S -> S -> S;
addrA : associative add;
}.
HB.structure Definition SemiGroup :=
{ S & is_semigroup S }.
HB.mixin Record monoid_of_semigroup (M : Type)
& is_semigroup M := {
zero : M;
add0r : left_id zero add;
addr0 : right_id zero add;
}.
HB.structure Definition Monoid :=
{ M & monoid_of_semigroup M }.
(* is_monoid does not exist anymore *)
Fail Check is_monoid.
HB.mixin Record xxxx P A := { F : bool }.
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