test262 built-ins/Promise — 21 (self-contained worklist)

[proggeramlug]

Self-contained worklist — 21 failing. Snapshot 2026-07-03 full sweep (perry 0.5.1218, node v26.3.0). Everything you need is in this issue; no history to read, no re-measure to start.

The meaty bit is real class X extends Promise subclass support (super(executor) internal slots + SpeciesConstructor). Crate: perry-runtime (promise).

Setup (any box)

git clone https://github.com/PerryTS/perry && cd perry
cargo build --release -p perry -p perry-runtime-static -p perry-stdlib-static
git clone --depth 1 https://github.com/tc39/test262 vendor/test262   # checkout test-compat/test262/pinned-sha.txt
# node on PATH (differential oracle). See test-compat/test262/README.md.

Measure/verify: scripts/test262_subset.py --root vendor/test262 --dir built-ins/Promise --jobs 8 (the .failures.txt sidecar lists failures; diff before/after for zero-regression).

Failure reasons

n	reason
5	TypeError: Constructor Promise requires 'new'
4	(no output)
3	TypeError: Promise resolve or reject function is not ca
2	Perry ran clean; Node rejected (missed negative)
2	TypeError: Promise method called on non-callable 'then'
2	TypeError: value is not a function
1	Uncaught exception: executor not called at all Expected
1	Uncaught exception: then() returns object Expected Same
1	TypeError: Promise.resolve called on non-object

All 21 failing cases (path — reason)

built-ins/Promise/all/ctx-ctor.js    TypeError: Promise resolve or reject function is not callable
built-ins/Promise/all/does-not-invoke-array-setters.js    Perry ran clean; Node rejected (missed negative)
built-ins/Promise/all/invoke-resolve-on-promises-every-iteration-of-custom.js    TypeError: Constructor Promise requires 'new'
built-ins/Promise/allSettled/ctx-ctor.js    TypeError: Promise resolve or reject function is not callable
built-ins/Promise/allSettled/does-not-invoke-array-setters.js    Perry ran clean; Node rejected (missed negative)
built-ins/Promise/allSettled/invoke-resolve-on-promises-every-iteration-of-custom.js    TypeError: Constructor Promise requires 'new'
built-ins/Promise/any/invoke-resolve-on-promises-every-iteration-of-custom.js    TypeError: Constructor Promise requires 'new'
built-ins/Promise/any/invoke-resolve-on-values-every-iteration-of-custom.js    TypeError: Constructor Promise requires 'new'
built-ins/Promise/prototype/catch/this-value-obj-coercible.js    TypeError: Promise method called on non-callable 'then'
built-ins/Promise/prototype/finally/rejected-observable-then-calls-PromiseResolve.js    (no output)
built-ins/Promise/prototype/finally/resolved-observable-then-calls-PromiseResolve.js    (no output)
built-ins/Promise/prototype/finally/species-constructor.js    TypeError: value is not a function
built-ins/Promise/prototype/finally/subclass-reject-count.js    (no output)
built-ins/Promise/prototype/finally/subclass-resolve-count.js    (no output)
built-ins/Promise/prototype/finally/this-value-proxy.js    TypeError: Promise method called on non-callable 'then'
built-ins/Promise/prototype/then/capability-executor-called-twice.js    TypeError: value is not a function
built-ins/Promise/prototype/then/capability-executor-not-callable.js    Uncaught exception: executor not called at all Expected SameValue(«""», «"a"») t
built-ins/Promise/prototype/then/deferred-is-resolved-value.js    Uncaught exception: then() returns object Expected SameValue(«1», «[object Objec
built-ins/Promise/race/ctx-ctor.js    TypeError: Promise resolve or reject function is not callable
built-ins/Promise/race/invoke-resolve-on-promises-every-iteration-of-custom.js    TypeError: Constructor Promise requires 'new'
built-ins/Promise/resolve/ctx-ctor.js    TypeError: Promise.resolve called on non-object

Workflow

Pick a coherent single-root subcluster, localize (cargo run --release -- f.ts --trace hir --focus <fn> / --trace llvm), fix, verify listed cases pass AND re-run the slice for zero regressions. Code-only PR (no Cargo.toml/Cargo.lock version bump, no CLAUDE.md Current-Version, no CHANGELOG — maintainer folds metadata). cargo fmt --all -- --check + bash scripts/check_file_size.sh must pass (files < 2000 lines). Reference this issue. Never reference internal infrastructure hostnames.

[proggeramlug]

PR #5991 lands the subclass-super core: 21 → 12 failing in built-ins/Promise (pass 553→557, parity 96.3%→97.9%, zero regressions). Fixes the {all,allSettled,race,resolve}/ctx-ctor (5) and {all,allSettled,race,any}/invoke-resolve-…-every-iteration-of-custom (5) clusters via a hidden backing-Promise-cell brand on subclass instances (mirrors object::map_set_subclass), receiver-unwrap at every dispatch site, and inherited-builtin-static resolution.

Remaining 12 (deeper, deferred as architectural):

• species-count semantics (finally/subclass-{resolve,reject}-count=7, finally/{resolved,rejected}-observable-then-calls-PromiseResolve=5): Perry's native promise fast path collapses the .finally().then() chain to count 1/3; matching node needs every internal step to route through NewPromiseCapability(subclass) + the observable per-step PromiseResolve, not the native shortcut.
• then-capability edge cases (then/capability-executor-{called-twice,not-callable}, then/deferred-is-resolved-value, finally/species-constructor): a subclass ctor that returns a plain {} (overriding this) must still drive NewPromiseCapability's resolve/reject-callable checks off that returned object.
• catch/finally this-value-{obj-coercible,proxy}: Promise.prototype.catch.call(primitive) where the primitive's prototype carries .then — needs primitive-this boxing for the Invoke(this,"then") lookup.
• {all,allSettled}/does-not-invoke-array-setters: unrelated negative-test miss (Perry runs clean where node's CreateArrayFromList triggers the Array.prototype[0] setter differently).