Add #include "pycore_pyerrors.h"

Author: sobolevn

Parser/action_helpers.c

@@ -2,6 +2,7 @@
 #include "pycore_pystate.h"         // _PyInterpreterState_GET()
 #include "pycore_runtime.h"         // _PyRuntime
 #include "pycore_unicodeobject.h"   // _PyUnicode_InternImmortal()
+#include "pycore_pyerrors.h"        // _PyErr_EmitSyntaxWarning()
 
 #include "pegen.h"
 #include "string_parser.h"          // _PyPegen_decode_string()