bpo-43244: Remove ast.h, asdl.h, Python-ast.h headers (GH-24933)

These functions were undocumented and excluded from the limited C
API.

Most names defined by these header files were not prefixed by "Py"
and so could create names conflicts. For example, Python-ast.h
defined a "Yield" macro which was conflict with the "Yield" name used
by the Windows <winbase.h> header.

Use the Python ast module instead.

* Move Include/asdl.h to Include/internal/pycore_asdl.h.
* Move Include/Python-ast.h to Include/internal/pycore_ast.h.
* Remove ast.h header file.
* pycore_symtable.h no longer includes Python-ast.h.

1 files changed, 8 insertions, 0 deletions

diff --git a/Misc/NEWS.d/next/C API/2021-03-19-12-56-11.bpo-43244.VuIyOD.rst b/Misc/NEWS.d/next/C API/2021-03-19-12-56-11.bpo-43244.VuIyOD.rst
new file mode 100644
index 0000000..1afe11e
--- /dev/null
+++ b/Misc/NEWS.d/next/C API/2021-03-19-12-56-11.bpo-43244.VuIyOD.rst
@@ -0,0 +1,8 @@
+Remove ``ast.h``, ``asdl.h``, and ``Python-ast.h`` header files.
+These functions were undocumented and excluded from the limited C API.
+Most names defined by these header files were not prefixed by ``Py`` and so
+could create names conflicts. For example, ``Python-ast.h`` defined a ``Yield``
+macro which was conflict with the ``Yield`` name used by the Windows
+``<winbase.h>`` header.
+Use the Python :mod:`ast` module instead.
+Patch by Victor Stinner.