test262 built-ins/Proxy — 22 (self-contained worklist)

[proggeramlug]

Self-contained worklist — 22 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.

Proxy trap invariant checks. Crate: perry-runtime (proxy/object).

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/Proxy --jobs 8 (the .failures.txt sidecar lists failures; diff before/after for zero-regression).

Failure reasons

n	reason
7	Uncaught exception: Expected a TypeError to be thrown b
5	(no output)
3	Uncaught exception: Expected true but got false
1	Uncaught exception: Expected SameValue(«undefined», «2»
1	Uncaught exception: Expected SameValue(«[object Object]
1	Uncaught exception: prototype should be an own property
1	ReferenceError: length is not defined
1	Uncaught exception: Expected SameValue(«false», «true»)
1	Uncaught exception: Proxy constructor does not have a p
1	Uncaught exception: handler object is the trap context

All 22 failing cases (path — reason)

built-ins/Proxy/construct/null-handler.js    (no output)
built-ins/Proxy/defineProperty/trap-is-missing-target-is-proxy.js    Uncaught exception: Expected a TypeError to be thrown but no exception was throw
built-ins/Proxy/deleteProperty/trap-is-missing-target-is-proxy.js    Uncaught exception: Expected a TypeError to be thrown but no exception was throw
built-ins/Proxy/deleteProperty/trap-is-null-target-is-proxy.js    Uncaught exception: Expected a TypeError to be thrown but no exception was throw
built-ins/Proxy/deleteProperty/trap-is-undefined-target-is-proxy.js    Uncaught exception: Expected true but got false
built-ins/Proxy/enumerate/removed-does-not-trigger.js    (no output)
built-ins/Proxy/get/trap-is-null-target-is-proxy.js    Uncaught exception: Expected SameValue(«undefined», «2») to be true
built-ins/Proxy/get/trap-is-undefined-receiver.js    Uncaught exception: Expected SameValue(«[object Object]», «[object Object]») to 
built-ins/Proxy/get/trap-is-undefined-target-is-proxy.js    (no output)
built-ins/Proxy/getOwnPropertyDescriptor/trap-is-missing-target-is-proxy.js    Uncaught exception: prototype should be an own property
built-ins/Proxy/getPrototypeOf/instanceof-custom-return-accepted.js    Uncaught exception: Expected true but got false
built-ins/Proxy/getPrototypeOf/instanceof-target-not-extensible-not-same-proto-throws.js    Uncaught exception: Expected a TypeError to be thrown but no exception was throw
built-ins/Proxy/has/trap-is-undefined-target-is-proxy.js    Uncaught exception: Expected true but got false
built-ins/Proxy/has/trap-is-undefined-using-with.js    ReferenceError: length is not defined
built-ins/Proxy/has/trap-is-undefined.js    Uncaught exception: Expected SameValue(«false», «true») to be true
built-ins/Proxy/proxy-no-prototype.js    Uncaught exception: Proxy constructor does not have a prototype property
built-ins/Proxy/proxy-undefined-newtarget.js    Uncaught exception: Expected a TypeError to be thrown but no exception was throw
built-ins/Proxy/set/call-parameters-prototype-index.js    Uncaught exception: handler object is the trap context Expected SameValue(«undef
built-ins/Proxy/setPrototypeOf/return-abrupt-from-isextensible-target.js    (no output)
built-ins/Proxy/setPrototypeOf/return-abrupt-from-target-getprototypeof.js    (no output)
built-ins/Proxy/setPrototypeOf/trap-is-missing-target-is-proxy.js    Uncaught exception: Expected a TypeError to be thrown but no exception was throw
built-ins/Proxy/setPrototypeOf/trap-is-undefined-target-is-proxy.js    Uncaught exception: Expected a TypeError to be thrown but no exception was throw

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.