Merged revisions 75224 via svnmerge from

svn+ssh://pythondev@svn.python.org/python/branches/py3k

................
  r75224 | benjamin.peterson | 2009-10-03 15:27:13 -0500 (Sat, 03 Oct 2009) | 9 lines

  Merged revisions 75223 via svnmerge from
  svn+ssh://pythondev@svn.python.org/python/trunk

  ........
    r75223 | benjamin.peterson | 2009-10-03 15:23:24 -0500 (Sat, 03 Oct 2009) | 1 line

    #7050 fix a SystemError when using tuple unpacking and augmented assignment
  ........
................

1 files changed, 13 insertions, 0 deletions

diff --git a/Python/ast.c b/Python/ast.c
index 83572ee882..b0684c5730 100644
--- a/Python/ast.c
+++ b/Python/ast.c
@@ -2105,6 +2105,19 @@ ast_for_expr_stmt(struct compiling *c, const node *n)
             return NULL;
         if(!set_context(c, expr1, Store, ch))
             return NULL;
+        /* set_context checks that most expressions are not the left side.
+          Augmented assignments can only have a name, a subscript, or an
+          attribute on the left, though, so we have to explicitly check for
+          those. */
+        switch (expr1->kind) {
+            case Name_kind:
+            case Attribute_kind:
+            case Subscript_kind:
+                break;
+            default:
+                ast_error(ch, "illegal expression for augmented assignment");
+                return NULL;
+        }
 
         ch = CHILD(n, 2);
         if (TYPE(ch) == testlist)