Fix iterating over cmpop_ty lists.

Parser/asdl_c.py

@@ -609,13 +609,21 @@ class ObjVisitor(PickleVisitor):
 
     def set(self, field, value, depth):
         if field.seq:
+            # XXX should really check for is_simple, but that requires a symbol table
             if field.type.value == "cmpop":
-                # XXX check that this cast is safe, i.e. works independent on whether
-                # sizeof(cmpop_ty) != sizeof(void*)
-                cast = "(PyObject*(*)(void*))"
+                # While the sequence elements are stored as void*,
+                # ast2obj_cmpop expects an enum
+                self.emit("{", depth)
+                self.emit("int i, n = asdl_seq_LEN(%s);" % value, depth+1)
+                self.emit("value = PyList_New(n);", depth+1)
+                self.emit("if (!value) goto failed;", depth+1)
+                self.emit("for(i = 0; i < n; i++)", depth+1)
+                # This cannot fail, so no need for error handling
+                self.emit("PyList_SET_ITEM(value, i, ast2obj_%s((%s_ty)asdl_seq_GET(%s, i)));" %
+                                (field.type, field.type, value), depth+2, reflow=False)
+                self.emit("}", depth)
             else:
-                cast = ""
-            self.emit("value = ast2obj_list(%s, %sast2obj_%s);" % (value, cast, field.type), depth)
+                self.emit("value = ast2obj_list(%s, ast2obj_%s);" % (value, field.type), depth)
         else:
             ctype = get_c_type(field.type)
             self.emit("value = ast2obj_%s(%s);" % (field.type, value), depth, reflow=False)

Python/Python-ast.c

@@ -2216,8 +2216,13 @@ ast2obj_expr(void* _o)
                 if (PyObject_SetAttrString(result, "left", value) == -1)
                         goto failed;
                 Py_DECREF(value);
-                value = ast2obj_list(o->v.Compare.ops,
-                                     (PyObject*(*)(void*))ast2obj_cmpop);
+                {
+                        int i, n = asdl_seq_LEN(o->v.Compare.ops);
+                        value = PyList_New(n);
+                        if (!value) goto failed;
+                        for(i = 0; i < n; i++)
+                                PyList_SET_ITEM(value, i, ast2obj_cmpop((cmpop_ty)asdl_seq_GET(o->v.Compare.ops, i)));
+                }
                 if (!value) goto failed;
                 if (PyObject_SetAttrString(result, "ops", value) == -1)
                         goto failed;