C extensions don't build with nightly Python 3.10

[The-Compiler]

When installing PyYAML with Python 3.10 (e.g. via the Archlinux AUR package or the deadsnakes python3.10-dev package, building C extensions fails:

    running build_ext
    building '_yaml' extension
    creating build/temp.linux-x86_64-3.10
    creating build/temp.linux-x86_64-3.10/ext
    gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O3 -Wall -march=x86-64 -mtune=generic -O3 -pipe -fno-plt -fno-semantic-interposition -march=x86-64 -mtune=generic -O3 -pipe -fno-plt -march=x86-64 -mtune=generic -O3 -pipe -fno-plt -fPIC -I/home/florian/tmp/pyyaml/.venv-310/include -I/usr/include/python3.10 -c ext/_yaml.c -o build/temp.linux-x86_64-3.10/ext/_yaml.o
    In file included from ext/_yaml.c:596:
    ext/_yaml.h:10: warning: "PyString_CheckExact" redefined
       10 | #define PyString_CheckExact PyBytes_CheckExact
          |
    ext/_yaml.c:486: note: this is the location of the previous definition
      486 |   #define PyString_CheckExact          PyUnicode_CheckExact
          |
    ext/_yaml.c: In function ‘__Pyx_PyList_Append’:
    ext/_yaml.c:1233:23: error: lvalue required as left operand of assignment
     1233 |         Py_SIZE(list) = len+1;
          |                       ^
    ext/_yaml.c: In function ‘__pyx_pf_5_yaml_get_version_string’:
    ext/_yaml.c:1891:17: warning: assignment discards ‘const’ qualifier from pointer target type [-Wdiscarded-qualifiers]
     1891 |   __pyx_v_value = yaml_get_version_string();
          |                 ^
    ext/_yaml.c: In function ‘__pyx_pf_5_yaml_7CParser___init__’:
    ext/_yaml.c:3391:52: warning: passing argument 2 of ‘yaml_parser_set_input’ from incompatible pointer type [-Wincompatible-pointer-types]
     3391 |     yaml_parser_set_input((&__pyx_v_self->parser), __pyx_f_5_yaml_input_handler, ((void *)__pyx_v_self));
          |                                                    ^~~~~~~~~~~~~~~~~~~~~~~~~~~~
          |                                                    |
          |                                                    int (*)(void *, char *, size_t,  size_t *) {aka int (*)(void *, char *, long unsigned int,  long unsigned int *)}
    In file included from ext/_yaml.h:2,
                     from ext/_yaml.c:596:
    /usr/include/yaml.h:1374:30: note: expected ‘int (*)(void *, unsigned char *, size_t,  size_t *)’ {aka ‘int (*)(void *, unsigned char *, long unsigned int,  long unsigned int *)’} but argument is of type ‘int (*)(void *, char *, size_t,  size_t *)’ {aka ‘int (*)(void *, char *, long unsigned int,  long unsigned int *)’}
     1374 |         yaml_read_handler_t *handler, void *data);
          |         ~~~~~~~~~~~~~~~~~~~~~^~~~~~~
    In file included from /usr/include/python3.10/bytesobject.h:75,
                     from /usr/include/python3.10/Python.h:96,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/cpython/bytesobject.h:32:57: warning: pointer targets in passing argument 2 of ‘yaml_parser_set_input_string’ differ in signedness [-Wpointer-sign]
       32 | #define PyBytes_AS_STRING(op) (assert(PyBytes_Check(op)), \
          |                               ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~
          |                                                         |
          |                                                         char *
       33 |                                 (((PyBytesObject *)(op))->ob_sval))
          |                                 ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
    ext/_yaml.h:11:29: note: in expansion of macro ‘PyBytes_AS_STRING’
       11 | #define PyString_AS_STRING  PyBytes_AS_STRING
          |                             ^~~~~~~~~~~~~~~~~
    ext/_yaml.c:3632:59: note: in expansion of macro ‘PyString_AS_STRING’
     3632 |     yaml_parser_set_input_string((&__pyx_v_self->parser), PyString_AS_STRING(__pyx_v_stream), PyString_GET_SIZE(__pyx_v_stream));
          |                                                           ^~~~~~~~~~~~~~~~~~
    In file included from ext/_yaml.h:2,
                     from ext/_yaml.c:596:
    /usr/include/yaml.h:1348:30: note: expected ‘const unsigned char *’ but argument is of type ‘char *’
     1348 |         const unsigned char *input, size_t size);
          |         ~~~~~~~~~~~~~~~~~~~~~^~~~~
    ext/_yaml.c: In function ‘__pyx_f_5_yaml_7CParser__token_to_object’:
    ext/_yaml.c:5466:71: warning: pointer targets in passing argument 1 of ‘PyUnicode_FromString’ differ in signedness [-Wpointer-sign]
     5466 |     __pyx_t_2 = PyUnicode_FromString(__pyx_v_token->data.tag_directive.handle); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 417, __pyx_L1_error)
          |                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
          |                                                                       |
          |                                                                       yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:138:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      138 |     const char *u              /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^
    ext/_yaml.c:5478:71: warning: pointer targets in passing argument 1 of ‘PyUnicode_FromString’ differ in signedness [-Wpointer-sign]
     5478 |     __pyx_t_2 = PyUnicode_FromString(__pyx_v_token->data.tag_directive.prefix); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 418, __pyx_L1_error)
          |                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
          |                                                                       |
          |                                                                       yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:138:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      138 |     const char *u              /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^
    ext/_yaml.c:6480:63: warning: pointer targets in passing argument 1 of ‘PyUnicode_FromString’ differ in signedness [-Wpointer-sign]
     6480 |     __pyx_t_2 = PyUnicode_FromString(__pyx_v_token->data.alias.value); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 448, __pyx_L1_error)
          |                                      ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
          |                                                               |
          |                                                               yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:138:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      138 |     const char *u              /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^
    ext/_yaml.c:6564:64: warning: pointer targets in passing argument 1 of ‘PyUnicode_FromString’ differ in signedness [-Wpointer-sign]
     6564 |     __pyx_t_2 = PyUnicode_FromString(__pyx_v_token->data.anchor.value); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 451, __pyx_L1_error)
          |                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
          |                                                                |
          |                                                                yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:138:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      138 |     const char *u              /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^
    ext/_yaml.c:6648:61: warning: pointer targets in passing argument 1 of ‘PyUnicode_FromString’ differ in signedness [-Wpointer-sign]
     6648 |     __pyx_t_2 = PyUnicode_FromString(__pyx_v_token->data.tag.handle); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 454, __pyx_L1_error)
          |                                      ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
          |                                                             |
          |                                                             yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:138:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      138 |     const char *u              /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^
    ext/_yaml.c:6660:61: warning: pointer targets in passing argument 1 of ‘PyUnicode_FromString’ differ in signedness [-Wpointer-sign]
     6660 |     __pyx_t_2 = PyUnicode_FromString(__pyx_v_token->data.tag.suffix); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 455, __pyx_L1_error)
          |                                      ~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
          |                                                             |
          |                                                             yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:138:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      138 |     const char *u              /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^
    ext/_yaml.c:6784:64: warning: pointer targets in passing argument 1 of ‘PyUnicode_DecodeUTF8’ differ in signedness [-Wpointer-sign]
     6784 |     __pyx_t_2 = PyUnicode_DecodeUTF8(__pyx_v_token->data.scalar.value, __pyx_v_token->data.scalar.length, ((char *)"strict")); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 460, __pyx_L1_error)
          |                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
          |                                                                |
          |                                                                yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:452:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      452 |     const char *string,         /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^~~~~~
    ext/_yaml.c: In function ‘__pyx_f_5_yaml_7CParser__event_to_object’:
    ext/_yaml.c:8465:63: warning: pointer targets in passing argument 1 of ‘PyUnicode_FromString’ differ in signedness [-Wpointer-sign]
     8465 |         __pyx_t_4 = PyUnicode_FromString(__pyx_v_tag_directive->handle); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 574, __pyx_L1_error)
          |                                          ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
          |                                                               |
          |                                                               yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:138:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      138 |     const char *u              /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^
    ext/_yaml.c:8477:63: warning: pointer targets in passing argument 1 of ‘PyUnicode_FromString’ differ in signedness [-Wpointer-sign]
     8477 |         __pyx_t_4 = PyUnicode_FromString(__pyx_v_tag_directive->prefix); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 575, __pyx_L1_error)
          |                                          ~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
          |                                                               |
          |                                                               yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:138:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      138 |     const char *u              /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^
    ext/_yaml.c:8720:63: warning: pointer targets in passing argument 1 of ‘PyUnicode_FromString’ differ in signedness [-Wpointer-sign]
     8720 |     __pyx_t_4 = PyUnicode_FromString(__pyx_v_event->data.alias.anchor); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 586, __pyx_L1_error)
          |                                      ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
          |                                                               |
          |                                                               yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:138:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      138 |     const char *u              /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^
    ext/_yaml.c:8824:66: warning: pointer targets in passing argument 1 of ‘PyUnicode_FromString’ differ in signedness [-Wpointer-sign]
     8824 |       __pyx_t_4 = PyUnicode_FromString(__pyx_v_event->data.scalar.anchor); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 591, __pyx_L1_error)
          |                                        ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
          |                                                                  |
          |                                                                  yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:138:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      138 |     const char *u              /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^
    ext/_yaml.c:8865:66: warning: pointer targets in passing argument 1 of ‘PyUnicode_FromString’ differ in signedness [-Wpointer-sign]
     8865 |       __pyx_t_4 = PyUnicode_FromString(__pyx_v_event->data.scalar.tag); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 594, __pyx_L1_error)
          |                                        ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
          |                                                                  |
          |                                                                  yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:138:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      138 |     const char *u              /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^
    ext/_yaml.c:8886:64: warning: pointer targets in passing argument 1 of ‘PyUnicode_DecodeUTF8’ differ in signedness [-Wpointer-sign]
     8886 |     __pyx_t_4 = PyUnicode_DecodeUTF8(__pyx_v_event->data.scalar.value, __pyx_v_event->data.scalar.length, ((char *)"strict")); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 595, __pyx_L1_error)
          |                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
          |                                                                |
          |                                                                yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:452:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      452 |     const char *string,         /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^~~~~~
    ext/_yaml.c:9227:74: warning: pointer targets in passing argument 1 of ‘PyUnicode_FromString’ differ in signedness [-Wpointer-sign]
     9227 |       __pyx_t_4 = PyUnicode_FromString(__pyx_v_event->data.sequence_start.anchor); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 620, __pyx_L1_error)
          |                                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
          |                                                                          |
          |                                                                          yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:138:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      138 |     const char *u              /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^
    ext/_yaml.c:9268:74: warning: pointer targets in passing argument 1 of ‘PyUnicode_FromString’ differ in signedness [-Wpointer-sign]
     9268 |       __pyx_t_4 = PyUnicode_FromString(__pyx_v_event->data.sequence_start.tag); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 623, __pyx_L1_error)
          |                                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
          |                                                                          |
          |                                                                          yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:138:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      138 |     const char *u              /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^
    ext/_yaml.c:9500:73: warning: pointer targets in passing argument 1 of ‘PyUnicode_FromString’ differ in signedness [-Wpointer-sign]
     9500 |       __pyx_t_4 = PyUnicode_FromString(__pyx_v_event->data.mapping_start.anchor); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 637, __pyx_L1_error)
          |                                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
          |                                                                         |
          |                                                                         yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:138:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      138 |     const char *u              /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^
    ext/_yaml.c:9541:73: warning: pointer targets in passing argument 1 of ‘PyUnicode_FromString’ differ in signedness [-Wpointer-sign]
     9541 |       __pyx_t_4 = PyUnicode_FromString(__pyx_v_event->data.mapping_start.tag); if (unlikely(!__pyx_t_4)) __PYX_ERR(0, 640, __pyx_L1_error)
          |                                        ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
          |                                                                         |
          |                                                                         yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:138:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      138 |     const char *u              /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^
    ext/_yaml.c: In function ‘__pyx_f_5_yaml_7CParser__compose_node’:
    ext/_yaml.c:11214:75: warning: pointer targets in passing argument 1 of ‘PyUnicode_FromString’ differ in signedness [-Wpointer-sign]
    11214 |     __pyx_t_3 = PyUnicode_FromString(__pyx_v_self->parsed_event.data.alias.anchor); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 734, __pyx_L1_error)
          |                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
          |                                                                           |
          |                                                                           yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:138:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      138 |     const char *u              /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^
    ext/_yaml.c:11534:76: warning: pointer targets in passing argument 1 of ‘PyUnicode_FromString’ differ in signedness [-Wpointer-sign]
    11534 |     __pyx_t_6 = PyUnicode_FromString(__pyx_v_self->parsed_event.data.scalar.anchor); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 750, __pyx_L1_error)
          |                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
          |                                                                            |
          |                                                                            yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:138:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      138 |     const char *u              /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^
    ext/_yaml.c:11590:84: warning: pointer targets in passing argument 1 of ‘PyUnicode_FromString’ differ in signedness [-Wpointer-sign]
    11590 |     __pyx_t_6 = PyUnicode_FromString(__pyx_v_self->parsed_event.data.sequence_start.anchor); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 753, __pyx_L1_error)
          |                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
          |                                                                                    |
          |                                                                                    yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:138:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      138 |     const char *u              /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^
    ext/_yaml.c:11646:83: warning: pointer targets in passing argument 1 of ‘PyUnicode_FromString’ differ in signedness [-Wpointer-sign]
    11646 |     __pyx_t_6 = PyUnicode_FromString(__pyx_v_self->parsed_event.data.mapping_start.anchor); if (unlikely(!__pyx_t_6)) __PYX_ERR(0, 756, __pyx_L1_error)
          |                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
          |                                                                                   |
          |                                                                                   yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:138:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      138 |     const char *u              /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^
    ext/_yaml.c: In function ‘__pyx_f_5_yaml_7CParser__compose_scalar_node’:
    ext/_yaml.c:12304:74: warning: pointer targets in passing argument 1 of ‘PyUnicode_DecodeUTF8’ differ in signedness [-Wpointer-sign]
    12304 |   __pyx_t_2 = PyUnicode_DecodeUTF8(__pyx_v_self->parsed_event.data.scalar.value, __pyx_v_self->parsed_event.data.scalar.length, ((char *)"strict")); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 791, __pyx_L1_error)
          |                                    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~
          |                                                                          |
          |                                                                          yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:452:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      452 |     const char *string,         /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^~~~~~
    ext/_yaml.c:12527:76: warning: pointer targets in passing argument 1 of ‘PyUnicode_FromString’ differ in signedness [-Wpointer-sign]
    12527 |     __pyx_t_2 = PyUnicode_FromString(__pyx_v_self->parsed_event.data.scalar.tag); if (unlikely(!__pyx_t_2)) __PYX_ERR(0, 804, __pyx_L1_error)
          |                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
          |                                                                            |
          |                                                                            yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:138:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      138 |     const char *u              /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^
    ext/_yaml.c: In function ‘__pyx_f_5_yaml_7CParser__compose_sequence_node’:
    ext/_yaml.c:13065:84: warning: pointer targets in passing argument 1 of ‘PyUnicode_FromString’ differ in signedness [-Wpointer-sign]
    13065 |     __pyx_t_3 = PyUnicode_FromString(__pyx_v_self->parsed_event.data.sequence_start.tag); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 837, __pyx_L1_error)
          |                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
          |                                                                                    |
          |                                                                                    yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:138:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      138 |     const char *u              /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^
    ext/_yaml.c: In function ‘__pyx_f_5_yaml_7CParser__compose_mapping_node’:
    ext/_yaml.c:13690:83: warning: pointer targets in passing argument 1 of ‘PyUnicode_FromString’ differ in signedness [-Wpointer-sign]
    13690 |     __pyx_t_3 = PyUnicode_FromString(__pyx_v_self->parsed_event.data.mapping_start.tag); if (unlikely(!__pyx_t_3)) __PYX_ERR(0, 876, __pyx_L1_error)
          |                                      ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~^~~~
          |                                                                                   |
          |                                                                                   yaml_char_t * {aka unsigned char *}
    In file included from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/unicodeobject.h:138:17: note: expected ‘const char *’ but argument is of type ‘yaml_char_t *’ {aka ‘unsigned char *’}
      138 |     const char *u              /* UTF-8 encoded string */
          |     ~~~~~~~~~~~~^
    ext/_yaml.c: In function ‘__pyx_f_5_yaml_input_handler’:
    ext/_yaml.c:14502:87: warning: comparison of integer expressions of different signedness: ‘int’ and ‘size_t’ {aka ‘long unsigned int’} [-Wsign-compare]
    14502 |   __pyx_t_3 = (((__pyx_v_parser->stream_cache_len - __pyx_v_parser->stream_cache_pos) < __pyx_v_size) != 0);
          |                                                                                       ^
    ext/_yaml.c: In function ‘__pyx_pf_5_yaml_8CEmitter___init__’:
    ext/_yaml.c:15021:53: warning: passing argument 2 of ‘yaml_emitter_set_output’ from incompatible pointer type [-Wincompatible-pointer-types]
    15021 |   yaml_emitter_set_output((&__pyx_v_self->emitter), __pyx_f_5_yaml_output_handler, ((void *)__pyx_v_self));
          |                                                     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~
          |                                                     |
          |                                                     int (*)(void *, char *, size_t) {aka int (*)(void *, char *, long unsigned int)}
    In file included from ext/_yaml.h:2,
                     from ext/_yaml.c:596:
    /usr/include/yaml.h:1844:31: note: expected ‘int (*)(void *, unsigned char *, size_t)’ {aka ‘int (*)(void *, unsigned char *, long unsigned int)’} but argument is of type ‘int (*)(void *, char *, size_t)’ {aka ‘int (*)(void *, char *, long unsigned int)’}
     1844 |         yaml_write_handler_t *handler, void *data);
          |         ~~~~~~~~~~~~~~~~~~~~~~^~~~~~~
    ext/_yaml.c: In function ‘__pyx_f_5_yaml_8CEmitter__object_to_event’:
    ext/_yaml.c:16373:44: warning: pointer targets in assignment from ‘char *’ to ‘yaml_char_t *’ {aka ‘unsigned char *’} differ in signedness [-Wpointer-sign]
    16373 |         __pyx_v_tag_directives_end->handle = PyString_AS_STRING(__pyx_v_handle);
          |                                            ^
    ext/_yaml.c:16488:44: warning: pointer targets in assignment from ‘char *’ to ‘yaml_char_t *’ {aka ‘unsigned char *’} differ in signedness [-Wpointer-sign]
    16488 |         __pyx_v_tag_directives_end->prefix = PyString_AS_STRING(__pyx_v_prefix);
          |                                            ^
    ext/_yaml.c:16825:62: warning: pointer targets in passing argument 2 of ‘yaml_alias_event_initialize’ differ in signedness [-Wpointer-sign]
    16825 |     __pyx_t_2 = ((yaml_alias_event_initialize(__pyx_v_event, __pyx_v_anchor) == 0) != 0);
          |                                                              ^~~~~~~~~~~~~~
          |                                                              |
          |                                                              char *
    In file included from ext/_yaml.h:2,
                     from ext/_yaml.c:596:
    /usr/include/yaml.h:555:69: note: expected ‘const yaml_char_t *’ {aka ‘const unsigned char *’} but argument is of type ‘char *’
      555 | yaml_alias_event_initialize(yaml_event_t *event, const yaml_char_t *anchor);
          |                                                  ~~~~~~~~~~~~~~~~~~~^~~~~~
    ext/_yaml.c:17540:63: warning: pointer targets in passing argument 2 of ‘yaml_scalar_event_initialize’ differ in signedness [-Wpointer-sign]
    17540 |     __pyx_t_2 = ((yaml_scalar_event_initialize(__pyx_v_event, __pyx_v_anchor, __pyx_v_tag, __pyx_v_value, __pyx_v_length, __pyx_v_plain_implicit, __pyx_v_quoted_implicit, __pyx_v_scalar_style) == 0) != 0);
          |                                                               ^~~~~~~~~~~~~~
          |                                                               |
          |                                                               char *
    In file included from ext/_yaml.h:2,
                     from ext/_yaml.c:596:
    /usr/include/yaml.h:581:28: note: expected ‘const yaml_char_t *’ {aka ‘const unsigned char *’} but argument is of type ‘char *’
      581 |         const yaml_char_t *anchor, const yaml_char_t *tag,
          |         ~~~~~~~~~~~~~~~~~~~^~~~~~
    ext/_yaml.c:17540:79: warning: pointer targets in passing argument 3 of ‘yaml_scalar_event_initialize’ differ in signedness [-Wpointer-sign]
    17540 |     __pyx_t_2 = ((yaml_scalar_event_initialize(__pyx_v_event, __pyx_v_anchor, __pyx_v_tag, __pyx_v_value, __pyx_v_length, __pyx_v_plain_implicit, __pyx_v_quoted_implicit, __pyx_v_scalar_style) == 0) != 0);
          |                                                                               ^~~~~~~~~~~
          |                                                                               |
          |                                                                               char *
    In file included from ext/_yaml.h:2,
                     from ext/_yaml.c:596:
    /usr/include/yaml.h:581:55: note: expected ‘const yaml_char_t *’ {aka ‘const unsigned char *’} but argument is of type ‘char *’
      581 |         const yaml_char_t *anchor, const yaml_char_t *tag,
          |                                    ~~~~~~~~~~~~~~~~~~~^~~
    ext/_yaml.c:17540:92: warning: pointer targets in passing argument 4 of ‘yaml_scalar_event_initialize’ differ in signedness [-Wpointer-sign]
    17540 |     __pyx_t_2 = ((yaml_scalar_event_initialize(__pyx_v_event, __pyx_v_anchor, __pyx_v_tag, __pyx_v_value, __pyx_v_length, __pyx_v_plain_implicit, __pyx_v_quoted_implicit, __pyx_v_scalar_style) == 0) != 0);
          |                                                                                            ^~~~~~~~~~~~~
          |                                                                                            |
          |                                                                                            char *
    In file included from ext/_yaml.h:2,
                     from ext/_yaml.c:596:
    /usr/include/yaml.h:582:28: note: expected ‘const yaml_char_t *’ {aka ‘const unsigned char *’} but argument is of type ‘char *’
      582 |         const yaml_char_t *value, int length,
          |         ~~~~~~~~~~~~~~~~~~~^~~~~
    ext/_yaml.c:17974:71: warning: pointer targets in passing argument 2 of ‘yaml_sequence_start_event_initialize’ differ in signedness [-Wpointer-sign]
    17974 |     __pyx_t_3 = ((yaml_sequence_start_event_initialize(__pyx_v_event, __pyx_v_anchor, __pyx_v_tag, __pyx_v_implicit, __pyx_v_sequence_style) == 0) != 0);
          |                                                                       ^~~~~~~~~~~~~~
          |                                                                       |
          |                                                                       char *
    In file included from ext/_yaml.h:2,
                     from ext/_yaml.c:596:
    /usr/include/yaml.h:604:28: note: expected ‘const yaml_char_t *’ {aka ‘const unsigned char *’} but argument is of type ‘char *’
      604 |         const yaml_char_t *anchor, const yaml_char_t *tag, int implicit,
          |         ~~~~~~~~~~~~~~~~~~~^~~~~~
    ext/_yaml.c:17974:87: warning: pointer targets in passing argument 3 of ‘yaml_sequence_start_event_initialize’ differ in signedness [-Wpointer-sign]
    17974 |     __pyx_t_3 = ((yaml_sequence_start_event_initialize(__pyx_v_event, __pyx_v_anchor, __pyx_v_tag, __pyx_v_implicit, __pyx_v_sequence_style) == 0) != 0);
          |                                                                                       ^~~~~~~~~~~
          |                                                                                       |
          |                                                                                       char *
    In file included from ext/_yaml.h:2,
                     from ext/_yaml.c:596:
    /usr/include/yaml.h:604:55: note: expected ‘const yaml_char_t *’ {aka ‘const unsigned char *’} but argument is of type ‘char *’
      604 |         const yaml_char_t *anchor, const yaml_char_t *tag, int implicit,
          |                                    ~~~~~~~~~~~~~~~~~~~^~~
    ext/_yaml.c:18408:70: warning: pointer targets in passing argument 2 of ‘yaml_mapping_start_event_initialize’ differ in signedness [-Wpointer-sign]
    18408 |     __pyx_t_2 = ((yaml_mapping_start_event_initialize(__pyx_v_event, __pyx_v_anchor, __pyx_v_tag, __pyx_v_implicit, __pyx_v_mapping_style) == 0) != 0);
          |                                                                      ^~~~~~~~~~~~~~
          |                                                                      |
          |                                                                      char *
    In file included from ext/_yaml.h:2,
                     from ext/_yaml.c:596:
    /usr/include/yaml.h:636:28: note: expected ‘const yaml_char_t *’ {aka ‘const unsigned char *’} but argument is of type ‘char *’
      636 |         const yaml_char_t *anchor, const yaml_char_t *tag, int implicit,
          |         ~~~~~~~~~~~~~~~~~~~^~~~~~
    ext/_yaml.c:18408:86: warning: pointer targets in passing argument 3 of ‘yaml_mapping_start_event_initialize’ differ in signedness [-Wpointer-sign]
    18408 |     __pyx_t_2 = ((yaml_mapping_start_event_initialize(__pyx_v_event, __pyx_v_anchor, __pyx_v_tag, __pyx_v_implicit, __pyx_v_mapping_style) == 0) != 0);
          |                                                                                      ^~~~~~~~~~~
          |                                                                                      |
          |                                                                                      char *
    In file included from ext/_yaml.h:2,
                     from ext/_yaml.c:596:
    /usr/include/yaml.h:636:55: note: expected ‘const yaml_char_t *’ {aka ‘const unsigned char *’} but argument is of type ‘char *’
      636 |         const yaml_char_t *anchor, const yaml_char_t *tag, int implicit,
          |                                    ~~~~~~~~~~~~~~~~~~~^~~
    ext/_yaml.c: In function ‘__pyx_pf_5_yaml_8CEmitter_12serialize’:
    ext/_yaml.c:19978:42: warning: pointer targets in assignment from ‘char *’ to ‘yaml_char_t *’ {aka ‘unsigned char *’} differ in signedness [-Wpointer-sign]
    19978 |       __pyx_v_tag_directives_end->handle = PyString_AS_STRING(__pyx_v_handle);
          |                                          ^
    ext/_yaml.c:20093:42: warning: pointer targets in assignment from ‘char *’ to ‘yaml_char_t *’ {aka ‘unsigned char *’} differ in signedness [-Wpointer-sign]
    20093 |       __pyx_v_tag_directives_end->prefix = PyString_AS_STRING(__pyx_v_prefix);
          |                                          ^
    ext/_yaml.c: In function ‘__pyx_f_5_yaml_8CEmitter__serialize_node’:
    ext/_yaml.c:20950:65: warning: pointer targets in passing argument 2 of ‘yaml_alias_event_initialize’ differ in signedness [-Wpointer-sign]
    20950 |     __pyx_t_2 = ((yaml_alias_event_initialize((&__pyx_v_event), __pyx_v_anchor) == 0) != 0);
          |                                                                 ^~~~~~~~~~~~~~
          |                                                                 |
          |                                                                 char *
    In file included from ext/_yaml.h:2,
                     from ext/_yaml.c:596:
    /usr/include/yaml.h:555:69: note: expected ‘const yaml_char_t *’ {aka ‘const unsigned char *’} but argument is of type ‘char *’
      555 | yaml_alias_event_initialize(yaml_event_t *event, const yaml_char_t *anchor);
          |                                                  ~~~~~~~~~~~~~~~~~~~^~~~~~
    ext/_yaml.c:21761:68: warning: pointer targets in passing argument 2 of ‘yaml_scalar_event_initialize’ differ in signedness [-Wpointer-sign]
    21761 |       __pyx_t_2 = ((yaml_scalar_event_initialize((&__pyx_v_event), __pyx_v_anchor, __pyx_v_tag, __pyx_v_value, __pyx_v_length, __pyx_v_plain_implicit, __pyx_v_quoted_implicit, __pyx_v_scalar_style) == 0) != 0);
          |                                                                    ^~~~~~~~~~~~~~
          |                                                                    |
          |                                                                    char *
    In file included from ext/_yaml.h:2,
                     from ext/_yaml.c:596:
    /usr/include/yaml.h:581:28: note: expected ‘const yaml_char_t *’ {aka ‘const unsigned char *’} but argument is of type ‘char *’
      581 |         const yaml_char_t *anchor, const yaml_char_t *tag,
          |         ~~~~~~~~~~~~~~~~~~~^~~~~~
    ext/_yaml.c:21761:84: warning: pointer targets in passing argument 3 of ‘yaml_scalar_event_initialize’ differ in signedness [-Wpointer-sign]
    21761 |       __pyx_t_2 = ((yaml_scalar_event_initialize((&__pyx_v_event), __pyx_v_anchor, __pyx_v_tag, __pyx_v_value, __pyx_v_length, __pyx_v_plain_implicit, __pyx_v_quoted_implicit, __pyx_v_scalar_style) == 0) != 0);
          |                                                                                    ^~~~~~~~~~~
          |                                                                                    |
          |                                                                                    char *
    In file included from ext/_yaml.h:2,
                     from ext/_yaml.c:596:
    /usr/include/yaml.h:581:55: note: expected ‘const yaml_char_t *’ {aka ‘const unsigned char *’} but argument is of type ‘char *’
      581 |         const yaml_char_t *anchor, const yaml_char_t *tag,
          |                                    ~~~~~~~~~~~~~~~~~~~^~~
    ext/_yaml.c:21761:97: warning: pointer targets in passing argument 4 of ‘yaml_scalar_event_initialize’ differ in signedness [-Wpointer-sign]
    21761 |       __pyx_t_2 = ((yaml_scalar_event_initialize((&__pyx_v_event), __pyx_v_anchor, __pyx_v_tag, __pyx_v_value, __pyx_v_length, __pyx_v_plain_implicit, __pyx_v_quoted_implicit, __pyx_v_scalar_style) == 0) != 0);
          |                                                                                                 ^~~~~~~~~~~~~
          |                                                                                                 |
          |                                                                                                 char *
    In file included from ext/_yaml.h:2,
                     from ext/_yaml.c:596:
    /usr/include/yaml.h:582:28: note: expected ‘const yaml_char_t *’ {aka ‘const unsigned char *’} but argument is of type ‘char *’
      582 |         const yaml_char_t *value, int length,
          |         ~~~~~~~~~~~~~~~~~~~^~~~~
    ext/_yaml.c:22148:76: warning: pointer targets in passing argument 2 of ‘yaml_sequence_start_event_initialize’ differ in signedness [-Wpointer-sign]
    22148 |       __pyx_t_2 = ((yaml_sequence_start_event_initialize((&__pyx_v_event), __pyx_v_anchor, __pyx_v_tag, __pyx_v_implicit, __pyx_v_sequence_style) == 0) != 0);
          |                                                                            ^~~~~~~~~~~~~~
          |                                                                            |
          |                                                                            char *
    In file included from ext/_yaml.h:2,
                     from ext/_yaml.c:596:
    /usr/include/yaml.h:604:28: note: expected ‘const yaml_char_t *’ {aka ‘const unsigned char *’} but argument is of type ‘char *’
      604 |         const yaml_char_t *anchor, const yaml_char_t *tag, int implicit,
          |         ~~~~~~~~~~~~~~~~~~~^~~~~~
    ext/_yaml.c:22148:92: warning: pointer targets in passing argument 3 of ‘yaml_sequence_start_event_initialize’ differ in signedness [-Wpointer-sign]
    22148 |       __pyx_t_2 = ((yaml_sequence_start_event_initialize((&__pyx_v_event), __pyx_v_anchor, __pyx_v_tag, __pyx_v_implicit, __pyx_v_sequence_style) == 0) != 0);
          |                                                                                            ^~~~~~~~~~~
          |                                                                                            |
          |                                                                                            char *
    In file included from ext/_yaml.h:2,
                     from ext/_yaml.c:596:
    /usr/include/yaml.h:604:55: note: expected ‘const yaml_char_t *’ {aka ‘const unsigned char *’} but argument is of type ‘char *’
      604 |         const yaml_char_t *anchor, const yaml_char_t *tag, int implicit,
          |                                    ~~~~~~~~~~~~~~~~~~~^~~
    ext/_yaml.c:22678:75: warning: pointer targets in passing argument 2 of ‘yaml_mapping_start_event_initialize’ differ in signedness [-Wpointer-sign]
    22678 |       __pyx_t_2 = ((yaml_mapping_start_event_initialize((&__pyx_v_event), __pyx_v_anchor, __pyx_v_tag, __pyx_v_implicit, __pyx_v_mapping_style) == 0) != 0);
          |                                                                           ^~~~~~~~~~~~~~
          |                                                                           |
          |                                                                           char *
    In file included from ext/_yaml.h:2,
                     from ext/_yaml.c:596:
    /usr/include/yaml.h:636:28: note: expected ‘const yaml_char_t *’ {aka ‘const unsigned char *’} but argument is of type ‘char *’
      636 |         const yaml_char_t *anchor, const yaml_char_t *tag, int implicit,
          |         ~~~~~~~~~~~~~~~~~~~^~~~~~
    ext/_yaml.c:22678:91: warning: pointer targets in passing argument 3 of ‘yaml_mapping_start_event_initialize’ differ in signedness [-Wpointer-sign]
    22678 |       __pyx_t_2 = ((yaml_mapping_start_event_initialize((&__pyx_v_event), __pyx_v_anchor, __pyx_v_tag, __pyx_v_implicit, __pyx_v_mapping_style) == 0) != 0);
          |                                                                                           ^~~~~~~~~~~
          |                                                                                           |
          |                                                                                           char *
    In file included from ext/_yaml.h:2,
                     from ext/_yaml.c:596:
    /usr/include/yaml.h:636:55: note: expected ‘const yaml_char_t *’ {aka ‘const unsigned char *’} but argument is of type ‘char *’
      636 |         const yaml_char_t *anchor, const yaml_char_t *tag, int implicit,
          |                                    ~~~~~~~~~~~~~~~~~~~^~~
    ext/_yaml.c: In function ‘__pyx_tp_dealloc_5_yaml_CParser’:
    ext/_yaml.c:23890:5: error: lvalue required as increment operand
    23890 |     ++Py_REFCNT(o);
          |     ^~
    ext/_yaml.c:23892:5: error: lvalue required as decrement operand
    23892 |     --Py_REFCNT(o);
          |     ^~
    ext/_yaml.c: In function ‘__pyx_tp_dealloc_5_yaml_CEmitter’:
    ext/_yaml.c:24071:5: error: lvalue required as increment operand
    24071 |     ++Py_REFCNT(o);
          |     ^~
    ext/_yaml.c:24073:5: error: lvalue required as decrement operand
    24073 |     --Py_REFCNT(o);
          |     ^~
    ext/_yaml.c: In function ‘__Pyx_ParseOptionalKeywords’:
    ext/_yaml.c:26135:21: warning: ‘_PyUnicode_get_wstr_length’ is deprecated [-Wdeprecated-declarations]
    26135 |                     (PyUnicode_GET_SIZE(**name) != PyUnicode_GET_SIZE(key)) ? 1 :
          |                     ^
    In file included from /usr/include/python3.10/unicodeobject.h:1026,
                     from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/cpython/unicodeobject.h:442:26: note: declared here
      442 | static inline Py_ssize_t _PyUnicode_get_wstr_length(PyObject *op) {
          |                          ^~~~~~~~~~~~~~~~~~~~~~~~~~
    ext/_yaml.c:26135:21: warning: ‘PyUnicode_AsUnicode’ is deprecated [-Wdeprecated-declarations]
    26135 |                     (PyUnicode_GET_SIZE(**name) != PyUnicode_GET_SIZE(key)) ? 1 :
          |                     ^
    In file included from /usr/include/python3.10/unicodeobject.h:1026,
                     from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/cpython/unicodeobject.h:576:45: note: declared here
      576 | Py_DEPRECATED(3.3) PyAPI_FUNC(Py_UNICODE *) PyUnicode_AsUnicode(
          |                                             ^~~~~~~~~~~~~~~~~~~
    ext/_yaml.c:26135:21: warning: ‘_PyUnicode_get_wstr_length’ is deprecated [-Wdeprecated-declarations]
    26135 |                     (PyUnicode_GET_SIZE(**name) != PyUnicode_GET_SIZE(key)) ? 1 :
          |                     ^
    In file included from /usr/include/python3.10/unicodeobject.h:1026,
                     from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/cpython/unicodeobject.h:442:26: note: declared here
      442 | static inline Py_ssize_t _PyUnicode_get_wstr_length(PyObject *op) {
          |                          ^~~~~~~~~~~~~~~~~~~~~~~~~~
    ext/_yaml.c:26135:21: warning: ‘_PyUnicode_get_wstr_length’ is deprecated [-Wdeprecated-declarations]
    26135 |                     (PyUnicode_GET_SIZE(**name) != PyUnicode_GET_SIZE(key)) ? 1 :
          |                     ^
    In file included from /usr/include/python3.10/unicodeobject.h:1026,
                     from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/cpython/unicodeobject.h:442:26: note: declared here
      442 | static inline Py_ssize_t _PyUnicode_get_wstr_length(PyObject *op) {
          |                          ^~~~~~~~~~~~~~~~~~~~~~~~~~
    ext/_yaml.c:26135:21: warning: ‘PyUnicode_AsUnicode’ is deprecated [-Wdeprecated-declarations]
    26135 |                     (PyUnicode_GET_SIZE(**name) != PyUnicode_GET_SIZE(key)) ? 1 :
          |                     ^
    In file included from /usr/include/python3.10/unicodeobject.h:1026,
                     from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/cpython/unicodeobject.h:576:45: note: declared here
      576 | Py_DEPRECATED(3.3) PyAPI_FUNC(Py_UNICODE *) PyUnicode_AsUnicode(
          |                                             ^~~~~~~~~~~~~~~~~~~
    ext/_yaml.c:26135:21: warning: ‘_PyUnicode_get_wstr_length’ is deprecated [-Wdeprecated-declarations]
    26135 |                     (PyUnicode_GET_SIZE(**name) != PyUnicode_GET_SIZE(key)) ? 1 :
          |                     ^
    In file included from /usr/include/python3.10/unicodeobject.h:1026,
                     from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/cpython/unicodeobject.h:442:26: note: declared here
      442 | static inline Py_ssize_t _PyUnicode_get_wstr_length(PyObject *op) {
          |                          ^~~~~~~~~~~~~~~~~~~~~~~~~~
    ext/_yaml.c:26151:25: warning: ‘_PyUnicode_get_wstr_length’ is deprecated [-Wdeprecated-declarations]
    26151 |                         (PyUnicode_GET_SIZE(**argname) != PyUnicode_GET_SIZE(key)) ? 1 :
          |                         ^
    In file included from /usr/include/python3.10/unicodeobject.h:1026,
                     from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/cpython/unicodeobject.h:442:26: note: declared here
      442 | static inline Py_ssize_t _PyUnicode_get_wstr_length(PyObject *op) {
          |                          ^~~~~~~~~~~~~~~~~~~~~~~~~~
    ext/_yaml.c:26151:25: warning: ‘PyUnicode_AsUnicode’ is deprecated [-Wdeprecated-declarations]
    26151 |                         (PyUnicode_GET_SIZE(**argname) != PyUnicode_GET_SIZE(key)) ? 1 :
          |                         ^
    In file included from /usr/include/python3.10/unicodeobject.h:1026,
                     from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/cpython/unicodeobject.h:576:45: note: declared here
      576 | Py_DEPRECATED(3.3) PyAPI_FUNC(Py_UNICODE *) PyUnicode_AsUnicode(
          |                                             ^~~~~~~~~~~~~~~~~~~
    ext/_yaml.c:26151:25: warning: ‘_PyUnicode_get_wstr_length’ is deprecated [-Wdeprecated-declarations]
    26151 |                         (PyUnicode_GET_SIZE(**argname) != PyUnicode_GET_SIZE(key)) ? 1 :
          |                         ^
    In file included from /usr/include/python3.10/unicodeobject.h:1026,
                     from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/cpython/unicodeobject.h:442:26: note: declared here
      442 | static inline Py_ssize_t _PyUnicode_get_wstr_length(PyObject *op) {
          |                          ^~~~~~~~~~~~~~~~~~~~~~~~~~
    ext/_yaml.c:26151:25: warning: ‘_PyUnicode_get_wstr_length’ is deprecated [-Wdeprecated-declarations]
    26151 |                         (PyUnicode_GET_SIZE(**argname) != PyUnicode_GET_SIZE(key)) ? 1 :
          |                         ^
    In file included from /usr/include/python3.10/unicodeobject.h:1026,
                     from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/cpython/unicodeobject.h:442:26: note: declared here
      442 | static inline Py_ssize_t _PyUnicode_get_wstr_length(PyObject *op) {
          |                          ^~~~~~~~~~~~~~~~~~~~~~~~~~
    ext/_yaml.c:26151:25: warning: ‘PyUnicode_AsUnicode’ is deprecated [-Wdeprecated-declarations]
    26151 |                         (PyUnicode_GET_SIZE(**argname) != PyUnicode_GET_SIZE(key)) ? 1 :
          |                         ^
    In file included from /usr/include/python3.10/unicodeobject.h:1026,
                     from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/cpython/unicodeobject.h:576:45: note: declared here
      576 | Py_DEPRECATED(3.3) PyAPI_FUNC(Py_UNICODE *) PyUnicode_AsUnicode(
          |                                             ^~~~~~~~~~~~~~~~~~~
    ext/_yaml.c:26151:25: warning: ‘_PyUnicode_get_wstr_length’ is deprecated [-Wdeprecated-declarations]
    26151 |                         (PyUnicode_GET_SIZE(**argname) != PyUnicode_GET_SIZE(key)) ? 1 :
          |                         ^
    In file included from /usr/include/python3.10/unicodeobject.h:1026,
                     from /usr/include/python3.10/Python.h:97,
                     from ext/_yaml.c:4:
    /usr/include/python3.10/cpython/unicodeobject.h:442:26: note: declared here
      442 | static inline Py_ssize_t _PyUnicode_get_wstr_length(PyObject *op) {
          |                          ^~~~~~~~~~~~~~~~~~~~~~~~~~
    Error compiling module, falling back to pure Python

[nitzmahone]

At first glance, this is likely a Cython issue around C API changes in Python 3.10- I'll leave this one open, but given that 3.9 isn't even hitting beta until October, 3.10 support is a ways off. We did some hasty releases too early in Python 3.8 trying to address Cython issues that ended up getting fixed directly in Cython and CPython- we had to re-release a couple times to end up landing exactly where we started. I don't want to make that mistake again, so we'll watch to see what happens and check up on this when 3.10 gets a little closer to reality (and the upstream tools we need actually verify support for it).

[The-Compiler]

FWIW I'm not sure if Python 3.9 is affected as well, and I currently don't have an easy way to test that.

[nitzmahone]

C extension builds/works fine under 3.9b3 on Fedora 32.

[nitzmahone]

I'm able to build against 3.10rc1 locally just fine, but I'm adding this to the 5.4.2 project since that's where official 3.10 support will come in.