Add an assert.

diff --git a/Python/ast.c b/Python/ast.c
index fbce7d71367fd428b317acde086a2b8502d19f2c..0506b47a3644c39a84322910f00c00f14ef93a7b 100644 (file)
--- a/Python/ast.c
+++ b/Python/ast.c
@@ -2178,6 +2178,7 @@ ast_for_import_stmt(struct compiling *c, const node *n)
     n = CHILD(n, 0);
     if (STR(CHILD(n, 0))[0] == 'i') { /* import */
         n = CHILD(n, 1);
+       REQ(n, dotted_as_names);
        aliases = asdl_seq_new((NCH(n) + 1) / 2);
        if (!aliases)
                return NULL;