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(* Refine and let-in's *)
Goal (EX x:nat | x=O).
Refine let y = (plus O O) in ?.
Exists y; Auto.
Save test1.
Goal (EX x:nat | x=O).
Refine let y = (plus O O) in (ex_intro ? ? (plus y y) ?).
Auto.
Save test2.
Goal nat.
Refine let y = O in (plus O ?).
Exact (S O).
Save test3.
(* Example submitted by Yves on coqdev *)
Require PolyList.
Goal (l:(list nat))l=l.
Proof.
Refine [l]<[l]l=l>
Cases l of
| nil => ?
| (cons O l0) => ?
| (cons (S _) l0) => ?
end.
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