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(* Check or-patterns *)
Definition g x :=
match x with ((((1 as x),_) | (_,x)), (_,(2 as y))|(y,_)) => (x,y) end.
Check (refl_equal _ : g ((1,2),(3,4)) = (1,3)).
Check (refl_equal _ : g ((1,4),(3,2)) = (1,2)).
Fixpoint max (n m:nat) {struct m} : nat :=
match n, m with
| S n', S m' => S (max n' m')
| 0, p | p, 0 => p
end.
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