create NameConstant AST class for None, True, and False literals (closes #16619)

1 files changed, 12 insertions, 0 deletions

diff --git a/Parser/asdl_c.py b/Parser/asdl_c.py
index a9e6626ab4..9557ba0cf2 100755
--- a/Parser/asdl_c.py
+++ b/Parser/asdl_c.py
@@ -820,6 +820,7 @@ static PyObject* ast2obj_object(void *o)
     Py_INCREF((PyObject*)o);
     return (PyObject*)o;
 }
+#define ast2obj_singleton ast2obj_object
 #define ast2obj_identifier ast2obj_object
 #define ast2obj_string ast2obj_object
 #define ast2obj_bytes ast2obj_object
@@ -831,6 +832,17 @@ static PyObject* ast2obj_int(long b)
 
 /* Conversion Python -> AST */
 
+static int obj2ast_singleton(PyObject *obj, PyObject** out, PyArena* arena)
+{
+    if (obj != Py_None && obj != Py_True && obj != Py_False) {
+        PyErr_SetString(PyExc_ValueError,
+                        "AST singleton must be True, False, or None");
+        return 1;
+    }
+    *out = obj;
+    return 0;
+}
+
 static int obj2ast_object(PyObject* obj, PyObject** out, PyArena* arena)
 {
     if (obj == Py_None)