test262 annexB/language at 50% — Annex B B.3.3 sloppy block-function hoisting

[proggeramlug]

Summary

Running the previously-skipped annexB/language test262 subtree (node v26 differential) scores 400/801 = 50% — the weakest newly-measured area. One root cause dominates.

Root cause (dominant): Annex B B.3.3 legacy block-level function declarations

In sloppy mode, a function f(){} declared inside a block must ALSO create a var-style binding in the enclosing function/global scope (Annex B.3.3 "FunctionDeclarationInstantiation" / block-level hoisting). Perry only block-scopes it.

Failure breakdown (401 fails):

• 252 eval-code (e.g. direct/func-switch-case-eval-func-block-scoping.js)
• 75 function-code (block-decl-func-block-scoping.js)
• 56 global-code (block-decl-global-block-scoping.js)
• 7 expressions, 6 literals, 5 statements

Dominant reasons:

• 126× ReferenceError: f is not defined — the B.3.3 enclosing-scope var binding is missing (function declared in block invisible outside it)
• 72× "Perry ran clean; Node rejected (missed negative)" — Perry too lenient on Annex B early errors (legacy octal in strict, etc.)
• 70× eval(...) refused at compile time — eval-using cases (pass once eval is enabled, see separate issue)
• 44× "value is not updated following eval", 34/14/10× block-scoping SameValue mismatches

Scope to close

Implement B.3.3 sloppy block-function hoisting (the enclosing-scope var binding) — clears ~250+. Then the missed-negatives (Annex B early-error semantics). The eval-refused subset overlaps the eval-enablement issue.

Measurement

scripts/test262_subset.py --dir annexB --all-features (annexB is path-skipped by default). node v26 oracle.