Regression: iterator_to_array() Generator via IIFE — closure param $g null TypeError (Zend/zend_closures.c)

[PurHur]

Category

Language · php-src-strict · closure invoke / Generator forwarding

Problem

Passing a Generator from a generator-expression closure into an immediately-invoked closure loses the argument on the VM. Zend materializes [1, 2] from both the IIFE path and the top-level call.

Repro	Zend 8.2 (Docker)	VM (2026-07-05)
(function (Generator $g) { return iterator_to_array($g); })($gen())	ok	Undefined variable $g + TypeError: iterator_to_array(): Argument #1 must be Traversable|array, null given
iterator_to_array($gen()) (top-level)	ok	ok

php-src reference

• php/php-src Zend/zend_closures.c — zend_invoke_closure_callable
• php/php-src ext/standard/array.c — PHP_FUNCTION(iterator_to_array)

PHP implementation target

• lib/Compiler.php — IIFE / call-site argument wiring for typed closure parameters
• ext/standard/VmClosureCall.php — ensure Generator objects copy/forward into invokeClosure
• lib/VM.php — invokeClosure arity binding when callee is a named closure expression

Repro

./script/docker-exec.sh -- bash -lc 'php test/repro/maintainer_gap_iterator_to_array_generator.php'
./script/docker-exec.sh -- bash -lc 'php bin/vm.php test/repro/maintainer_gap_iterator_to_array_generator.php'

Done when

• maintainer_gap_iterator_to_array_generator.php prints ok on VM (IIFE + top-level)
• Compliance .phpt guard under test/compliance/cases/language/ for Generator-through-IIFE
• JIT/AOT agree when both backends lower the closure invoke path
• php-src-strict; no php-compiler-strict shortcut

[PurHur]

claim: cursor-agent-lane-a — starting this run

[PurHur]

claim released: repro green on master — maintainer_gap_iterator_to_array_generator.php prints ok on VM and Zend.