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+Set Universe Polymorphism.
+
+Require Import ssreflect.
+
+Axiom mult@{i} : nat -> nat -> nat.
+Notation "m * n" := (mult m n).
+
+Axiom multA : forall a b c, (a * b) * c = a * (b * c).
+
+(* Previously the following gave a universe error: *)
+
+Lemma multAA a b c d : ((a * b) * c) * d = a * (b * (c * d)).
+Proof. by rewrite !multA. Qed.