[3.9] bpo-41690: Use a loop to collect args in the parser instead of recursion (GH-22053) (GH-22067)
This program can segfault the parser by stack overflow:
```
import ast
code = "f(" + ",".join(['a' for _ in range(100000)]) + ")"
print("Ready!")
ast.parse(code)
```
the reason is that the rule for arguments has a simple recursion when collecting args:
args[expr_ty]:
[...]
| a=named_expression b=[',' c=args { c }] {
[...] }.
(cherry picked from commit 4a97b1517a6b5ff22e2984b677a680b07ff0ce11)
Co-authored-by: Pablo Galindo <Pablogsal@gmail.com>diff --git a/Parser/pegen/pegen.h b/Parser/pegen/pegen.h
index 361b671..4ae8d4c 100644
--- a/Parser/pegen/pegen.h
+++ b/Parser/pegen/pegen.h
@@ -257,6 +257,7 @@
KeywordOrStarred *_PyPegen_keyword_or_starred(Parser *, void *, int);
asdl_seq *_PyPegen_seq_extract_starred_exprs(Parser *, asdl_seq *);
asdl_seq *_PyPegen_seq_delete_starred_exprs(Parser *, asdl_seq *);
+expr_ty _PyPegen_collect_call_seqs(Parser *, asdl_seq *, asdl_seq *);
expr_ty _PyPegen_concatenate_strings(Parser *p, asdl_seq *);
asdl_seq *_PyPegen_join_sequences(Parser *, asdl_seq *, asdl_seq *);
int _PyPegen_check_barry_as_flufl(Parser *);