def METHOD_NAME(self, node, arg):
    if not isinstance(arg, ast.Call):
        return
    try:
        aliases = self.strict_aliases[arg.func]
    except KeyError:
        return
    for alias in aliases:
        if is_global_constant(alias):
            raise PythranSyntaxError(
                ("Cannot modify '{}': global variables are constant "
                 "in pythran.").format(alias.name),
                arg.func)