Cute code causing explorer outline to go blank

Type: Bug

I can not imagine me ever using this code, but reporting it might help ironing out some likely bugs.

Example code:

class Bug {
    // if this method exist in a file then outline panel in explorer sidebar goes blank
    // - diplaying greyed "No symbols found in document this-n-that".
    // Comment it out to see outline spring back to life.
    static function defer(?SplStack &$_, callable $callback) : void {
        $_ ??= new class() extends SplStack {
            public function __destruct() {
                while($this->count() > 0) call_user_func($this->pop());
            }
        };
        $_->push($callback);
    }
}

The code in reality works as advertised (Go-lang style defer hack/functionality) with no issues and as far as i can see is also perfectly legal. Right?

Extension version: 1.46.15409 VS Code version: Code 1.89.0 (b58957e67ee1e712cebf466b995adf4c5307b2bd, 2024-05-01T02:09:22.859Z) OS version: Windows_NT x64 10.0.19045 Modes:

System Info

|Item|Value| |---|---| |CPUs|Intel(R) Core(TM) i7-7700 CPU @ 3.60GHz (8 x 3600)| |GPU Status|2d_canvas: enabled
canvas_oop_rasterization: enabled_on
direct_rendering_display_compositor: disabled_off_ok
gpu_compositing: enabled
multiple_raster_threads: enabled_on
opengl: enabled_on
rasterization: enabled
raw_draw: disabled_off_ok
skia_graphite: disabled_off
video_decode: enabled
video_encode: enabled
vulkan: disabled_off
webgl: enabled
webgl2: enabled
webgpu: enabled| |Load (avg)|undefined| |Memory (System)|15.88GB (7.30GB free)| |Process Argv|--crash-reporter-id adf79977-8c83-4303-918e-a7dfc5f31bf1| |Screen Reader|no| |VM|0%|

A/B Experiments

``` vsliv368:30146709 vspor879:30202332 vspor708:30202333 vspor363:30204092 tftest:31042121 vscod805cf:30301675 binariesv615:30325510 vsaa593:30376534 py29gd2263:31024239 c4g48928:30535728 azure-dev_surveyone:30548225 a9j8j154:30646983 962ge761:30959799 pythongtdpath:30769146 welcomedialog:30910333 pythonidxpt:30866567 pythonnoceb:30805159 asynctok:30898717 pythontestfixt:30902429 pythonregdiag2:30936856 pyreplss1:30897532 pythonmypyd1:30879173 pythoncet0:30885854 h48ei257:31000450 pythontbext0:30879054 accentitlementsc:30995553 dsvsc016:30899300 dsvsc017:30899301 dsvsc018:30899302 cppperfnew:31000557 dsvsc020:30976470 pythonait:31006305 showvideot:31016892 chatpanelc:31018788 dsvsc021:30996838 bdiig495:31013172 fchga941:31046352 pythonprt:31039817 dwnewjupyter:31039675 ```

DEVSENSE / phptools-docs

Cute code causing explorer outline to go blank #557