Add PHP 8.5 support

[MarcelloDuarte]

Why

Console did not declare PHP 8.5, and was in fact broken on it: Behat scored 228 of 421 scenarios. Every failure traced to one upstream deprecation — ImmMap::plus() backs every REPL session variable and called SplObjectStorage::attach(), deprecated in 8.5. Behat turns deprecations into exceptions, so every variable assignment threw.

Fixed upstream in phunkie 1.3.0 and pinned here. Behat on 8.5 now passes 484 of 484.

New syntax

The REPL interprets the AST rather than eval'ing it, so new syntax needs an explicit evaluator branch.

Casts had no branch at all — even (int) "42" reported Unsupported expression type. Adding only (void) would have left every sibling cast broken, so this adds one Expr\Cast branch covering int/float/string/bool/array/object, with (void) as one further arm reusing the existing __no_output__ path.

Pipe |> applies its right operand to its left rather than combining two values, so it gets its own handler ahead of the operator table, in the same shape as the existing Coalesce case. Semantics are native PHP 8.5 ($x |> f(...) is f($x)); composition sugar belongs in phunkiec, not here.

First-class callables for user-defined functions were rejected, documented as a permanent limitation because functions are "stored as AST nodes, not as callable PHP functions". They are stored as closures — the restriction was unnecessary. Piping into your own functions depends on it.

Deprecations are now reported, not hidden

8.5 deprecates a great deal, and the REPL handled deprecations three different ways depending on which path evaluated the code. The boundary swallowed them, while each of five eval'd definition sites installed its own handler that trapped every severity and turned it into a Failure — so a deprecated trait reported an Error even though the class was defined fine.

Deciding what a deprecation means is the boundary's job. The definition sites now share trapDefinitionErrors(), which keeps genuine errors local but passes deprecations out to the handler it replaced:

phunkie > $p->setAccessible(true)
Deprecated: Method ReflectionProperty::setAccessible() is deprecated since 8.5
$var0: Null = null

This also drops the @ from those eval() calls: it zeroed error_reporting for the whole call, which is what hid the deprecations, and bought nothing — the shared handler already returns true, so nothing leaks, and eval parse failures are ParseError throwables. The @ operator itself is unchanged.

Version gating

bin/run-behat-tests.sh grew one hardcoded elif per release, and its final else was labelled "8.4+", so features/repl/php8.5/ would have wrongly run on 8.4. It now derives exclusions from the directory names, so php8.6/ will need no change.

That also fixed a latent bug: the old 8.2/8.3 branches rooted their find at features/repl, silently never running features/execution. Scenario count on 8.2 goes 327 → 329, exactly the two scenarios in run_app.feature.

Coverage added

features/repl/php8.5/ — 51 scenarios across pipe operator, void cast, clone() with properties, array_first/array_last, error-handler introspection, final property promotion, #[\Override] on properties, the URI extension, and deprecation reporting. Plus features/repl/casts.feature (unversioned — casts are not an 8.5 feature).

Two expectations were corrected against the real runtime rather than the docs: replacing a readonly property via clone() is refused from global scope and only works inside the declaring class, and WhatWg host normalisation lowercases but does not decode percent-escapes.

Not done — blocked on gaps that predate 8.5

8.5 feature	Blocked by
Asymmetric visibility for static properties	Expr\StaticPropertyFetch unsupported
Missing trait as a catchable Error	Stmt\TryCatch unsupported
Closures / FCC / casts in const expressions, attributes on global constants	Stmt\Const_ unsupported
Closure::getCurrent()	REPL interprets closure bodies, so there is no real closure

Each is its own pre-existing gap rather than 8.5 work; try/catch is probably the most valuable.

Verification

Behat, PHPUnit, PHPStan and PHP-CS-Fixer green on 8.2, 8.3, 8.4 and 8.5 — 341, 384, 433 and 484 scenarios respectively.