del test and assignment fix

Cython/Compiler/TypeInference.py

@@ -121,6 +121,12 @@ class MarkAssignments(CythonTransform):
         self.visitchildren(node)
         return node
 
+    def visit_DelStatNode(self, node):
+        for arg in node.args:
+            self.mark_assignment(arg, arg)
+        self.visitchildren(node)
+        return node
+
 class MarkOverflowingArithmetic(CythonTransform):
 
     # It may be possible to integrate this with the above for

tests/errors/e_del2.pyx

-# Errors reported during code generation.
-
-cdef int i
-
-def f(a):
-	del a # error: deletion of local name not supported
-	del i # error: deletion of local name not supported
-
-_ERRORS = u"""
-6:52: Deletion of local or C global name not supported
-7:52: Deletion of local or C global name not supported
-"""

tests/run/delete.pyx

@@ -80,3 +80,10 @@ def del_temp_slice(a):
     while a.attr:
         del a.attr[:]
     return a.attr
+
+def del_local(a):
+    """
+    >>> del_local(object())
+    """
+    del a
+    assert a is None # Until we have unbound locals...