PHP_Parser v4 introduces a string type declaration on a parameter, breaking PHP 7.1 installations

[Ocramius]

As reported in #448:

• https://github.com/nikic/PHP-Parser/blob/v3.1.5/lib/PhpParser/Parser.php
• https://github.com/nikic/PHP-Parser/blob/v4.0.0/lib/PhpParser/Parser.php

The signature of this API changed.

In PHP 7.2, this is not a problem, because removing the type declaration is perfectly fine, but in PHP 7.1, a change in type signature is not allowed in subclasses.

To fix this, we could:

• add the string hint, and lock onto PHP-Parser v4
• drop PHP 7.1 support

[Ocramius]

Doesn't seem to be still valid, according to current CI runs with ^4.0.4.

Closing.