Typehint callable not supported

[lstrojny]

PHP 5.4 introduces the callable typehint to allow closures, string $function and array($obj, 'method'). See http://php.net/manual/de/language.types.callable.php for details. HipHop analyzes callable as UnknownClass.

[paroski]

HipHop does not currently support all PHP 5.4 features. We plan to add support for the "callable" typehint some time in the coming months.

[ptarjan]

It's there now: cc37fe6

[evert]

This is still failing for me:

<?php

function callMe(callable $b) {

    $b();

}

callMe(function() {

    echo "hello\n";

});

Throws:

HipHop Fatal error: Argument 1 passed to callMe() must be an instance of callable, Closure$callMe$47daeefeedcd4b135f362b25e98454cc$ given in /Users/evert/code/sabre/event/tests/foo3.php on line 7

Version:

$ hhvm --version
HipHop VM v2.3.0-dev (rel)
Compiler: heads/master-0-gf6413a9d4ca5a0646290bf180702e967ff1daf61
Repo schema: 536d56f98b940f0920eafa10249dca34d2e855de

[scannell]

@paroski, this seems to work only when EnableHipHopSyntax=1. Any idea why?