bpo-29622: loosen positional argument check of AST constructor

Author: methane

Parser/asdl_c.py

@@ -666,11 +666,10 @@ def visitModule(self, mod):
     }
     res = 0; /* if no error occurs, this stays 0 to the end */
     if (PyTuple_GET_SIZE(args) > 0) {
-        if (numfields != PyTuple_GET_SIZE(args)) {
-            PyErr_Format(PyExc_TypeError, "%.400s constructor takes %s"
+        if (numfields < PyTuple_GET_SIZE(args)) {
+            PyErr_Format(PyExc_TypeError, "%.400s constructor takes at most "
                          "%zd positional argument%s",
                          Py_TYPE(self)->tp_name,
-                         numfields == 0 ? "" : "either 0 or ",
                          numfields, numfields == 1 ? "" : "s");
             res = -1;
             goto cleanup;

Python/Python-ast.c

@@ -553,11 +553,10 @@ ast_type_init(PyObject *self, PyObject *args, PyObject *kw)
     }
     res = 0; /* if no error occurs, this stays 0 to the end */
     if (PyTuple_GET_SIZE(args) > 0) {
-        if (numfields != PyTuple_GET_SIZE(args)) {
-            PyErr_Format(PyExc_TypeError, "%.400s constructor takes %s"
+        if (numfields < PyTuple_GET_SIZE(args)) {
+            PyErr_Format(PyExc_TypeError, "%.400s constructor takes at most "
                          "%zd positional argument%s",
                          Py_TYPE(self)->tp_name,
-                         numfields == 0 ? "" : "either 0 or ",
                          numfields, numfields == 1 ? "" : "s");
             res = -1;
             goto cleanup;