function effect_in_teardown(rune) {
	if (DEV) {
		const error = new Error(`effect_in_teardown\n\`${rune}\` cannot be used inside an effect cleanup function\nhttps://svelte.dev/e/effect_in_teardown`);

		error.name = 'Svelte error';
		throw error;
	} else {
		throw new Error(`https://svelte.dev/e/effect_in_teardown`);
	}
}
`%rune%` cannot be used inside an effect cleanup function
@param {string} rune
@returns {never}