[pypy-svn] r7325 - pypy/trunk/src/pypy/objspace/flow

[arigo at codespeak.net]

Author: arigo
Date: Wed Nov 17 15:44:49 2004
New Revision: 7325

Modified:
   pypy/trunk/src/pypy/objspace/flow/objspace.py
Log:
Detect early a situation which throws the flow object space into an infinite
loop.


Modified: pypy/trunk/src/pypy/objspace/flow/objspace.py
==============================================================================
--- pypy/trunk/src/pypy/objspace/flow/objspace.py	(original)
+++ pypy/trunk/src/pypy/objspace/flow/objspace.py	Wed Nov 17 15:44:49 2004
@@ -140,6 +140,12 @@
                 len(result), expected_length)
         return result
 
+    def unpackiterable(self, w_iterable, expected_length=None):
+        if isinstance(w_iterable, Variable) and expected_length is None:
+            raise UnwrapException, ("cannot unpack a Variable iterable "
+                                    "without knowing its length")
+        return ObjSpace.unpackiterable(self, w_iterable, expected_length)
+
     # ____________________________________________________________
     def do_operation(self, name, *args_w):
         spaceop = SpaceOperation(name, args_w, Variable())