push-densely-nonwritable-length.js (568B)
1 function f(arr, v) 2 { 3 arr.push(v); 4 } 5 6 function basic(out) 7 { 8 // Use a much-greater capacity than the eventual non-writable length. 9 var a = out.a = [0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15]; 10 Object.defineProperty(a, "length", { writable: false, value: 6 }); 11 12 f(a, 99); 13 } 14 15 var obj = {}; 16 var a; 17 18 try 19 { 20 basic(obj); 21 throw new Error("didn't throw!"); 22 } 23 catch (e) 24 { 25 assertEq(e instanceof TypeError, true, "expected TypeError, got " + e); 26 27 a = obj.a; 28 assertEq(a.hasOwnProperty(6), false); 29 assertEq(a[6], undefined); 30 assertEq(a.length, 6); 31 }