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this is undefined inside a do…while body in non-class functions (breaks node-forge rsa_sign) #11724
Description
Found by the package matrix re-run (#11723): node-forge/rsa_sign throws TypeError: … (reading 'data'). Reproduces 3/3 at 9e29f59 and on origin/main 9e05951.
Inside a do…while body, this is undefined in any non-class function. A plain while loop works, and so does a class method.
const o = { d: 7, f(n) { let r = 0; do { r += this.d; n--; } while (n > 0); return r; } };
console.log(o.f(1)); // node: 7; perry: throws TypeError
Activity
proggeramlug commentedon Oct 1, 2026
Hint for whoever picks this up: a fix attempt that was stopped part-way traced it to two separate statement walkers that don't handle
do…whilebodies the same way (likely thethis/captures analysis after #11637 madethisa body parameter). The planned fix was to replace both walkers with one exhaustive helper, so no statement kind can be missed. Please also checkfor/for-in/for-of/labeled loops/continuepaths, andarguments/new.targetinside do-while. Acceptance: the repro matches Node, and node-forge/rsa_sign passes (scripts/package_bench.py, benchmarks/packages).