Is there a way to negate `?:` ? as to make asserte...

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[ursus]

Is there a way to negate ?: ? as to make assertedNoCall oneliner?

private fun assertedCall(): SipCall {
        return this.call ?: throw IllegalStateException("Call is null")
    }

    private fun assertedNoCall() {
        val call = this.call
        if (call != null) throw IllegalStateException("Call is not null")
    }