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+Set Keyed Unification.
+
+Section foo.
+Variable f : nat -> nat. 
+
+Definition g := f.
+
+Variable lem : g 0 = 0.
+
+Goal f 0 = 0.
+Proof.
+  Fail rewrite lem.
+Abort.
+
+Declare Equivalent Keys @g @f.
+(** Now f and g are considered equivalent heads for subterm selection *)
+Goal f 0 = 0.
+Proof.
+  rewrite lem.
+  reflexivity.
+Qed.
+
+Print Equivalent Keys.
+End foo.