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function assert(x) { if (!x) console.log("FAIL"); } try { throw 1; } catch (e) { assert(e === 1); } try { throw [99]; } catch (e) { assert(typeof e === "object"); assert(e.length === 1); } function foo() { throw "hello"; } try { foo(); } catch (e) { assert(e === "hello"); } console.log("PASS");