(int|string)[] is unextractable

[mvangeest]

The README states:

Phan supports (int|string)[] style annotations, and represents them internally as int[]|string[] (Both annotations are treated like array which may have integers and/or strings).

However, when I run Phan (master) on the following...

<?php

/**
 * @return (int|string)[]
 */
function intsAndStrings()
{
    return [1, 'two', 3];
}

... it tells me the annotation is no good:

test.php:4 PhanUnextractableAnnotation Saw unextractable annotation for comment '* @return (int|string)[]'

I think there are two good reasons to support (int|string)[]:

1. its equivalent array<int|string> is supported
2. phpDocumentor likes it, although it warns that it might not be supported

If this issue is fixed, I also suggest changing the BNF on About Union Types to show that ARRAY_TYPE is allowed to contain a UNION_TYPE wrapped in parentheses.

[TysonAndre]

I agree that it should be added. I was having some problems with type_regex the last time I tried supporting this.

[TysonAndre]

Or it may have broken in an earlier refactoring