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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.