Issue #23501: Argumen Clinic now generates code into separate files by default.

Modules/clinic/_codecsmodule.c.h

@@ -0,0 +1,32 @@
+/*[clinic input]
+preserve
+[clinic start generated code]*/
+
+PyDoc_STRVAR(_codecs__forget_codec__doc__,
+"_forget_codec($module, encoding, /)\n"
+"--\n"
+"\n"
+"Purge the named codec from the internal codec lookup cache");
+
+#define _CODECS__FORGET_CODEC_METHODDEF    \
+    {"_forget_codec", (PyCFunction)_codecs__forget_codec, METH_VARARGS, _codecs__forget_codec__doc__},
+
+static PyObject *
+_codecs__forget_codec_impl(PyModuleDef *module, const char *encoding);
+
+static PyObject *
+_codecs__forget_codec(PyModuleDef *module, PyObject *args)
+{
+    PyObject *return_value = NULL;
+    const char *encoding;
+
+    if (!PyArg_ParseTuple(args,
+        "s:_forget_codec",
+        &encoding))
+        goto exit;
+    return_value = _codecs__forget_codec_impl(module, encoding);
+
+exit:
+    return return_value;
+}
+/*[clinic end generated code: output=cdea83e21d76a900 input=a9049054013a1b77]*/