#3117: backport r55087, fixes segfault with lambda (None,): None.
diff --git a/Lib/test/test_grammar.py b/Lib/test/test_grammar.py
index 6a9e512..09ccde7 100644
--- a/Lib/test/test_grammar.py
+++ b/Lib/test/test_grammar.py
@@ -277,6 +277,7 @@
verify(l5(1, 2) == 5)
verify(l5(1, 2, 3) == 6)
check_syntax("lambda x: x = 2")
+check_syntax("lambda (None,): None")
### stmt: simple_stmt | compound_stmt
# Tested below
diff --git a/Python/ast.c b/Python/ast.c
index c7fd8bc..057b64d 100644
--- a/Python/ast.c
+++ b/Python/ast.c
@@ -249,6 +249,8 @@
goto error;
asdl_seq_SET(stmts, 0, Pass(n->n_lineno, n->n_col_offset,
arena));
+ if (!asdl_seq_GET(stmts, 0))
+ goto error;
return Interactive(stmts, arena);
}
else {
@@ -679,6 +681,8 @@
if (NCH(ch) != 1) {
/* We have complex arguments, setup for unpacking. */
asdl_seq_SET(args, k++, compiler_complex_args(c, ch));
+ if (!asdl_seq_GET(args, k-1))
+ goto error;
} else {
/* def foo((x)): setup for checking NAME below. */
/* Loop because there can be many parens and tuple