The list comp patch checked for the second child node of the 'listmaker'
node, without checking if the node actually had more than one child. It can
have only one node, though: '[' test ']'. This fixes it.
diff --git a/Python/compile.c b/Python/compile.c
index adefb4f..476f1f2 100644
--- a/Python/compile.c
+++ b/Python/compile.c
@@ -1045,7 +1045,7 @@
com_listmaker(struct compiling *c, node *n)
{
/* listmaker: test ( list_iter | (',' test)* [','] ) */
- if (TYPE(CHILD(n, 1)) == list_iter)
+ if (NCH(n) > 1 && TYPE(CHILD(n, 1)) == list_iter)
com_list_comprehension(c, n);
else {
int len = 0;