Preserve compatibility on examples such as "intros []." on goals such as "forall x:nat*nat, x=x", which resulted in "forall n n0 : nat, (n, n0) = (n, n0)" before commit 37f68259ab0a33c3b5b41de70b08422d9bcd3bec on "Fixing introduction patterns * and ** ".
Preserve compatibility on examples such as "intros []." on goals such
as "forall x:nat*nat, x=x", which resulted in
"forall n n0 : nat, (n, n0) = (n, n0)" before commit
37f68259ab0a33c3b5b41de70b08422d9bcd3bec on "Fixing introduction
patterns * and ** ".

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