tmp_ipv6_bind_test.mjs
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tmp_ipv6_bind_test.mjs
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	import net from 'node:net';

	function tryListen(port, host) {
	return new Promise((resolve) => {
	const server = net.createServer();
	server.once('error', (e) => {
	console.log(` error on ${host}:${port} — code=${e.code} message=${e.message}`);
	server.close(() => resolve({ ok: false, code: e.code }));
	});
	server.once('listening', () => {
	const addr = server.address();
	console.log(` listening on ${JSON.stringify(addr)}`);
	server.close(() => resolve({ ok: true }));
	});
	server.listen(port, host);
	});
	}

	const hosts = ['0.0.0.0', '::', '0000:0000:0000:0000:0000:0000:0000:0000'];
	for (const host of hosts) {
	process.stdout.write(`tryListen(9874, '${host}') ... `);
	const result = await tryListen(9874, host);
	console.log(result.ok ? 'ok' : `fail(${result.code})`);
	}

	console.log('done');