| function shouldThrow(func, errorMessage) { |
| var errorThrown = false; |
| var error = null; |
| try { |
| func(); |
| } catch (e) { |
| errorThrown = true; |
| error = e; |
| } |
| if (!errorThrown) |
| throw new Error('not thrown'); |
| if (String(error) !== errorMessage) |
| throw new Error(`bad error: ${String(error)}`); |
| } |
| noInline(shouldThrow); |
| |
| for (var i = 0; i < 1e5; ++i) { |
| shouldThrow(() => { |
| new (class extends Array { static get [Symbol.species]() { return makeMasquerader(); } })(1, 2, 3).flat().constructor |
| }, `TypeError: Species construction did not get a valid constructor`); |
| } |
