❯ ./python.exe Python 3.12.0a7+ (heads/fix-updating-fstring-buffers-tok:0056701aa3, Apr 23 2023, 11:12:49) [Clang 14.0.3 (clang-1403.0.22.14.1)] on darwinType "help", "copyright", "credits" or "license" for more information.>>> f"... ===================================================================8991==ERROR: AddressSanitizer: heap-use-after-free on address 0x000104313550 at pc 0x0001006c6d98 bp 0x00016fa28e70 sp 0x00016fa28e68READ of size 1 at 0x000104313550 thread T0    #0 0x1006c6d94 in unicode_decode_utf8 unicodeobject.c:4526    #1 0x1006cc0bc in PyUnicode_DecodeUTF8 unicodeobject.c:4431    #2 0x10050f1d8 in _syntaxerror_range tokenizer.c:1252    #3 0x10050da08 in syntaxerror tokenizer.c:1294    #4 0x100500bbc in _PyTokenizer_Get tokenizer.c:2639    #5 0x1003d6810 in _PyPegen_fill_token pegen.c:201    #6 0x100475738 in fstring_replacement_field_rule parser.c:15626    #7 0x1003eeb98 in fstring_rule parser.c:1334    #8 0x10044b1fc in strings_rule parser.c:15962    #9 0x10041b00c in atom_rule parser.c:14388    #10 0x100427ee4 in t_primary_rule parser.c:18429    #11 0x1004ef890 in single_subscript_attribute_target_rule parser.c:18319    #12 0x1004e75a8 in _tmp_13_rule parser.c:25515    #13 0x1004d8a34 in simple_stmt_rule parser.c:1730    #14 0x1003f4140 in simple_stmts_rule parser.c:1625    #15 0x1003e81f4 in _PyPegen_parse parser.c:41238    #16 0x1003da7b4 in _PyPegen_run_parser pegen.c:825    #17 0x1003dae14 in _PyPegen_run_parser_from_file_pointer pegen.c:897    #18 0x1004fdc6c in _PyParser_ASTFromFile peg_api.c:26    #19 0x1008f0c74 in PyRun_InteractiveOneObjectEx pythonrun.c:240    #20 0x1008efa04 in _PyRun_InteractiveLoopObject pythonrun.c:137    #21 0x1008ef6e8 in _PyRun_AnyFileObject pythonrun.c:72    #22 0x1008f0920 in PyRun_AnyFileExFlags pythonrun.c:104    #23 0x100943acc in Py_RunMain main.c:689    #24 0x1009448d4 in pymain_main main.c:719    #25 0x100944b74 in Py_BytesMain main.c:743    #26 0x1003d5b7c in main python.c:15    #27 0x18e8dff24  (<unknown module>)0x000104313550 is located 16 bytes inside of 28-byte region [0x000104313540,0x00010431355c)freed by thread T0 here:    #0 0x101c070ec in wrap_realloc+0x9c (libclang_rt.asan_osx_dynamic.dylib:arm64e+0x430ec) (BuildId: f0a7ac5c49bc3abc851181b6f92b308a32000000200000000100000000000b00)    #1 0x10065213c in _PyMem_RawRealloc obmalloc.c:64    #2 0x100653cd0 in _PyMem_DebugRawRealloc obmalloc.c:1957    #3 0x1006544e4 in _PyMem_DebugRealloc obmalloc.c:2045    #4 0x100654afc in PyMem_Realloc obmalloc.c:609    #5 0x10050e950 in tok_reserve_buf tokenizer.c:480    #6 0x10050c3c4 in tok_nextc tokenizer.c:1198    #7 0x100500490 in _PyTokenizer_Get tokenizer.c:2639    #8 0x1003d6810 in _PyPegen_fill_token pegen.c:201    #9 0x100475738 in fstring_replacement_field_rule parser.c:15626    #10 0x1003eeb98 in fstring_rule parser.c:1334    #11 0x10044b1fc in strings_rule parser.c:15962    #12 0x10041b00c in atom_rule parser.c:14388    #13 0x100427ee4 in t_primary_rule parser.c:18429    #14 0x1004ef890 in single_subscript_attribute_target_rule parser.c:18319    #15 0x1004e75a8 in _tmp_13_rule parser.c:25515    #16 0x1004d8a34 in simple_stmt_rule parser.c:1730    #17 0x1003f4140 in simple_stmts_rule parser.c:1625    #18 0x1003e81f4 in _PyPegen_parse parser.c:41238    #19 0x1003da7b4 in _PyPegen_run_parser pegen.c:825    #20 0x1003dae14 in _PyPegen_run_parser_from_file_pointer pegen.c:897    #21 0x1004fdc6c in _PyParser_ASTFromFile peg_api.c:26    #22 0x1008f0c74 in PyRun_InteractiveOneObjectEx pythonrun.c:240    #23 0x1008efa04 in _PyRun_InteractiveLoopObject pythonrun.c:137    #24 0x1008ef6e8 in _PyRun_AnyFileObject pythonrun.c:72    #25 0x1008f0920 in PyRun_AnyFileExFlags pythonrun.c:104    #26 0x100943acc in Py_RunMain main.c:689    #27 0x1009448d4 in pymain_main main.c:719    #28 0x100944b74 in Py_BytesMain main.c:743    #29 0x1003d5b7c in main python.c:15previously allocated by thread T0 here:    #0 0x101c06e68 in wrap_malloc+0x94 (libclang_rt.asan_osx_dynamic.dylib:arm64e+0x42e68) (BuildId: f0a7ac5c49bc3abc851181b6f92b308a32000000200000000100000000000b00)    #1 0x1006520f8 in _PyMem_RawMalloc obmalloc.c:42    #2 0x100654144 in _PyMem_DebugMalloc obmalloc.c:2022    #3 0x100654a04 in PyMem_Malloc obmalloc.c:587    #4 0x10050b620 in tok_nextc tokenizer.c:1198    #5 0x100504848 in tok_get_normal_mode tokenizer.c:1619    #6 0x1005006ac in _PyTokenizer_Get tokenizer.c:2639    #7 0x1003d6810 in _PyPegen_fill_token pegen.c:201    #8 0x1003e71f4 in _PyPegen_parse parser.c:41238    #9 0x1003da7b4 in _PyPegen_run_parser pegen.c:825    #10 0x1003dae14 in _PyPegen_run_parser_from_file_pointer pegen.c:897    #11 0x1004fdc6c in _PyParser_ASTFromFile peg_api.c:26    #12 0x1008f0c74 in PyRun_InteractiveOneObjectEx pythonrun.c:240    #13 0x1008efa04 in _PyRun_InteractiveLoopObject pythonrun.c:137    #14 0x1008ef6e8 in _PyRun_AnyFileObject pythonrun.c:72    #15 0x1008f0920 in PyRun_AnyFileExFlags pythonrun.c:104    #16 0x100943acc in Py_RunMain main.c:689    #17 0x1009448d4 in pymain_main main.c:719    #18 0x100944b74 in Py_BytesMain main.c:743    #19 0x1003d5b7c in main python.c:15    #20 0x18e8dff24  (<unknown module>)SUMMARY: AddressSanitizer: heap-use-after-free unicodeobject.c:4526 in unicode_decode_utf8Shadow bytes around the buggy address:  0x007020882650: fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa fa  0x007020882660: fa fa fa fa fa fa fa fa fa fa fa fa 00 00 00 05  0x007020882670: fa fa 00 00 00 05 fa fa fd fd fd fd fa fa fd fd  0x007020882680: fd fd fa fa fd fd fd fd fa fa fd fd fd fd fa fa  0x007020882690: fd fd fd fd fa fa 00 00 00 00 fa fa 00 00 00 00=>0x0070208826a0: fa fa fd fd fd fd fa fa fd fd[fd]fd fa fa fd fd  0x0070208826b0: fd fd fa fa fd fd fd fd fa fa fd fd fd fd fa fa  0x0070208826c0: fd fd fd fd fa fa 00 00 00 00 fa fa 00 00 00 06  0x0070208826d0: fa fa 00 00 00 03 fa fa 00 00 02 fa fa fa 00 00  0x0070208826e0: 00 00 fa fa 00 00 02 fa fa fa 00 00 02 fa fa fa  0x0070208826f0: 00 00 02 fa fa fa 00 00 02 fa fa fa 00 00 00 01Shadow byte legend (one shadow byte represents 8 application bytes):  Addressable:           00  Partially addressable: 01 02 03 04 05 06 07   Heap left redzone:       fa  Freed heap region:       fd  Stack left redzone:      f1  Stack mid redzone:       f2  Stack right redzone:     f3  Stack after return:      f5  Stack use after scope:   f8  Global redzone:          f9  Global init order:       f6  Poisoned by user:        f7  Container overflow:      fc  Array cookie:            ac  Intra object redzone:    bb  ASan internal:           fe  Left alloca redzone:     ca  Right alloca redzone:    cb==8991==ABORTINGzsh: abort      ./python.exe