New issue with test during PR19764:

0:03:29 [416/423/1] test_peg_generator failed (2 min 34 sec) -- running: test_pathlib (3 min 19 sec), test_bufio (3 min 17 sec), test_concurrent_futures (3 min 10 sec), test_multiprocessing_fork (3 min), test_subprocess (2 min 49 sec), test_multiprocessing_forkserver (3 min 18 sec), test_multiprocessing_spawn (2 min 56 sec)
[]

\u2514\u2500\u2500Rule
   \u2514\u2500\u2500Rhs
      \u2514\u2500\u2500Alt
         \u251c\u2500\u2500NamedItem
         \u2502  \u2514\u2500\u2500StringLeaf("'a'")
         \u2514\u2500\u2500NamedItem
            \u2514\u2500\u2500Opt
               \u2514\u2500\u2500Rhs
                  \u2514\u2500\u2500Alt
                     \u251c\u2500\u2500NamedItem
                     \u2502  \u2514\u2500\u2500StringLeaf("'b'")
                     \u2514\u2500\u2500NamedItem
                        \u2514\u2500\u2500Opt
                           \u2514\u2500\u2500Rhs
                              \u2514\u2500\u2500Alt
                                 \u251c\u2500\u2500NamedItem
                                 \u2502  \u2514\u2500\u2500StringLeaf("'c'")
                                 \u2514\u2500\u2500NamedItem
                                    \u2514\u2500\u2500Opt
                                       \u2514\u2500\u2500Rhs
                                          \u2514\u2500\u2500Alt
                                             \u2514\u2500\u2500NamedItem
                                                \u2514\u2500\u2500StringLeaf("'d'")

start() ... (looking at 1.0: OP:'(')
  expect('(') ... (looking at 1.0: OP:'(')
  ... expect('(') -> TokenInfo(type=54 (OP), string='(', start=(1, 0), end=(1, 1), line='(1)')
  expr() ... (looking at 1.1: NUMBER:'1')
    number() ... (looking at 1.1: NUMBER:'1')
    ... number() -> TokenInfo(type=2 (NUMBER), string='1', start=(1, 1), end=(1, 2), line='(1)')
  ... expr() -> [TokenInfo(type=2 (NUMBER), string='1', start=(1, 1), end=(1, 2), line='(1)')]
  expect(')') ... (looking at 1.2: OP:')')
  ... expect(')') -> TokenInfo(type=54 (OP), string=')', start=(1, 2), end=(1, 3), line='(1)')
... start() -> [TokenInfo(type=54 (OP), string='(', start=(1, 0), end=(1, 1), line='(1)'), [TokenInfo(type=2 (NUMBER), string='1', start=(1, 1), end=(1, 2), line='(1)')], TokenInfo(type=54 (OP), string=')', start=(1
Rule('start', None, Rhs([Alt([NamedItem(None, Gather(StringLeaf("','"), NameLeaf('thing'))), NamedItem(None, NameLeaf('NEWLINE'))])]))
/tmp/tmp9nzhxvu1/parse.c: In function 'start_rule':
/tmp/tmp9nzhxvu1/parse.c:32:35: warning: passing argument 2 of '_PyPegen_lookahead' from incompatible pointer type [-Wincompatible-pointer-types]
             _PyPegen_lookahead(1, _PyPegen_name_token, p)
                                   ^~~~~~~~~~~~~~~~~~~
In file included from /tmp/tmp9nzhxvu1/parse.c:2:0:
/home/aixtools/python/cpython-master/Parser/pegen/pegen.h:90:5: note: expected 'void * (*)(Parser *) {aka void * (*)(struct <anonymous> *)}' but argument is of type 'struct _expr * (*)(Parser *) {aka struct _expr * (*)(struct <anonymous> *)}'
 int _PyPegen_lookahead(int, void *(func)(Parser *), Parser *);
     ^~~~~~~~~~~~~~~~~~
/tmp/tmp1qne6lpy/parse.c: In function 'start_rule':
/tmp/tmp1qne6lpy/parse.c:32:35: warning: passing argument 2 of '_PyPegen_lookahead' from incompatible pointer type [-Wincompatible-pointer-types]
             _PyPegen_lookahead(0, _PyPegen_name_token, p)
                                   ^~~~~~~~~~~~~~~~~~~
In file included from /tmp/tmp1qne6lpy/parse.c:2:0:
/home/aixtools/python/cpython-master/Parser/pegen/pegen.h:90:5: note: expected 'void * (*)(Parser *) {aka void * (*)(struct <anonymous> *)}' but argument is of type 'struct _expr * (*)(Parser *) {aka struct _expr * (*)(struct <anonymous> *)}'
 int _PyPegen_lookahead(int, void *(func)(Parser *), Parser *);
     ^~~~~~~~~~~~~~~~~~
test test_peg_generator failed -- multiple errors occurred; run in verbose mode for details
0:03:47 [417/423/1] test_pathlib passed (3 min 36 sec) -- running: test_bufio (3 min 35 sec), test_concurrent_futures (3 min 27 sec), test_multiprocessing_fork (3 min 18 sec), test_subprocess (3 min 6 sec), test_multiprocessing_forkserver (3 min 35 sec), test_multiprocessing_spawn (3 min 14 sec)
0:03:51 [418/423/1] test_multiprocessing_fork passed (3 min 21 sec) -- running: test_bufio (3 min 39 sec), test_concurrent_futures (3 min 32 sec), test_subprocess (3 min 11 sec), test_multiprocessing_forkserver (3 min 40 sec), test_multiprocessing_spawn (3 min 18 sec)
/home/aixtools/python/cpython-master/Lib/multiprocessing/resource_tracker.py:216: UserWarning: resource_tracker: There appear to be 1 leaked shared_memory objects to clean up at shutdown
  warnings.warn('resource_tracker: There appear to be %d '
/home/aixtools/python/cpython-master/Lib/multiprocessing/resource_tracker.py:229: UserWarning: resource_tracker: '/psm_35e4dd20': [Errno 2] No such file or directory: '/psm_35e4dd20'
  warnings.warn('resource_tracker: %r: %s' % (name, e))
0:04:00 [419/423/1] test_bufio passed (3 min 47 sec) -- running: test_concurrent_futures (3 min 41 sec), test_subprocess (3 min 20 sec), test_multiprocessing_forkserver (3 min 49 sec), test_multiprocessing_spawn (3 min 27 sec)
0:04:03 [420/423/1] test_subprocess passed (3 min 21 sec) -- running: test_concurrent_futures (3 min 43 sec), test_multiprocessing_forkserver (3 min 51 sec), test_multiprocessing_spawn (3 min 29 sec)

This is with gcc as compiler. Shall repeat with xlc and only update if different.