We need to have _iter_unpack_sequence_ always in the globals.

src/AccessControl/ZopeGuards.py

@@ -23,6 +23,7 @@
 import RestrictedPython
 from RestrictedPython.Eval import RestrictionCapableEval
 from RestrictedPython.Guards import full_write_guard
+from RestrictedPython.Guards import guarded_iter_unpack_sequence
 from RestrictedPython.Guards import safe_builtins
 from RestrictedPython.Utilities import utility_builtins
 from zExceptions import Unauthorized
@@ -652,6 +653,7 @@ def protected_inplacevar(op, var, expr):
     '_apply_': guarded_apply,
     '_getitem_': guarded_getitem,
     '_getiter_': guarded_iter,
+    '_iter_unpack_sequence_': guarded_iter_unpack_sequence,
     '_print_': RestrictedPython.PrintCollector,
     '_write_': full_write_guard,
     '_inplacevar_': protected_inplacevar,

src/AccessControl/tests/testZopeGuards.py

@@ -904,13 +904,11 @@ def test_guarded_next__3(self):
     def _compile_str(self, text, name):
         from RestrictedPython import compile_restricted
         from AccessControl.ZopeGuards import get_safe_globals, guarded_getattr
-        from RestrictedPython.Guards import guarded_iter_unpack_sequence
 
         code = compile_restricted(text, name, 'exec')
 
         g = get_safe_globals()
         g['_getattr_'] = guarded_getattr
-        g['_iter_unpack_sequence_'] = guarded_iter_unpack_sequence
         g['__debug__'] = 1  # so assert statements are active
         g['__name__'] = __name__  # so classes can be defined in the script
         return code, g