test_computed_assignment_order.js
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test_computed_assignment_order.js
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	const failures = [];

	function assertOrder(name, got, expected) {
	const ok = got.length === expected.length && got.every((v, i) => v === expected[i]);
	if (!ok) failures.push(`${name}: expected [${expected.join(', ')}], got [${got.join(', ')}]`);
	}

	{
	const order = [];
	const base = {};
	const getObj = () => { order.push('obj'); return base; };
	const key = () => { order.push('key'); return 'k'; };
	const rhs = () => { order.push('rhs'); return 1; };
	getObj()[key()] = rhs();
	assertOrder('computed assignment order', order, ['obj', 'key', 'rhs']);
	}

	{
	const order = [];
	const base = {};
	const getObj = () => { order.push('obj'); return base; };
	const rhs = () => { order.push('rhs'); return 1; };
	getObj().x = rhs();
	assertOrder('named assignment order', order, ['obj', 'rhs']);
	}

	if (failures.length) {
	console.log('Assignment order failures:');
	for (let i = 0; i < failures.length; i++) {
	console.log(` ${i + 1}. ${failures[i]}`);
	}
	throw new Error(`Found ${failures.length} assignment-order regression(s)`);
	}

	console.log('PASS: assignment evaluation order');