#7050 fix a SystemError when using tuple unpacking and augmented assignment
diff --git a/Python/ast.c b/Python/ast.c
index 2f975ac..3422c2e 100644
--- a/Python/ast.c
+++ b/Python/ast.c
@@ -2097,6 +2097,19 @@
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)