Change iter fn

Author: whoami730

src/sage/interfaces/maxima_abstract.py

@@ -1689,17 +1689,6 @@ def __getitem__(self, i):
             # If you change the i+1 to i below, better change __iter__ as well.
             return InterfaceElement.__getitem__(self, i+1)
 
-    def __iter_without_mutation(self):
-        """
-        Returns an iterator for ``self``. It is assumed that ``self`` won't be
-        mutated during the iteration.
-        """
-        N = len(self)
-        z = self
-        for _ in range(N):
-            yield z.first()
-            z = z.rest()
-
     def __iter__(self):
         """
         Return an iterator for ``self``.
@@ -1713,8 +1702,9 @@ def __iter__(self):
             sage: [e._sage_() for e in L]
             [0, x, 2*x^2, 3*x^3, 4*x^4, 5*x^5]
         """
-        # NOTE: `self` should not be mutated during iteration
-        return self.__iter_without_mutation()
+        z = self.copy()
+        for _ in range(len(z)):
+            yield z.pop()
 
     def subst(self, val):
         """