test_tco_zeroarg.js
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test_tco_zeroarg.js
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	// Test: verify zero-arg tail call actually uses TCO by going deep enough to
	// guarantee a stack overflow without it.

	// Pure zero-arg self-recursion with no parameters at all
	let n = 0;
	function go() {
	n++;
	if (n >= 1000000) return 'ok';
	return go();
	}
	const r = go();
	console.log('result:', r, 'n:', n);
	if (r !== 'ok') { console.log('FAIL'); process.exit(1); }

	// Zero-arg mutual recursion
	let m = 0;
	function a() { m++; if (m >= 1000000) return m; return b(); }
	function b() { m++; if (m >= 1000000) return m; return a(); }
	const r2 = a();
	console.log('mutual result:', r2);
	if (r2 !== 1000000) { console.log('FAIL'); process.exit(1); }

	console.log('PASS');