def wrap_passthrough(self, text, multiline=True):
        """Wrap a passthrough."""
        if not multiline:
            text = text.lstrip()
        if multiline:
            out = "\\"
        else:
            out = "\\\\"
        out += self.add_ref("passthrough", text) + unwrapper
        if not multiline:
            out += "\n"
        return out
Wrap a passthrough.