Fix crash

theano/gof/link.py

@@ -731,9 +731,9 @@ class WrapLinker(Linker):
             wrapper=self.wrapper)
         return other
 
-    def clone(allow_gc=undef):
+    def clone(self, allow_gc=undef):
         return self.__class__(
-            linkers=[l.clone(allow_gc=allow_gc)],
+            linkers=[l.clone(allow_gc=allow_gc) for l in self.linkers],
             wrapper=self.wrapper)
 
     def accept(self, fgraph, no_recycling=None):