PHP 7 Reserved Keywords Clash

[chestnutcase]

Good day.

Your classnames for types (PHPAST\Integer, PHPAST\Float etc) clashes with reserved keywords in PHP 7.

Attempting to load your library in your provided examples will result in the following:

Fatal error: Cannot use 'Float' as class name as it is reserved in /project/vendor/flaviovs/phpast/src/core/types.php on line 42

From the PHP manual,

The following words cannot be used to name a class, interface or trait, and they are also prohibited from being used in namespaces.

float (as of PHP 7)

I suggest suffixing your classnames with something like Token or Type, so your classes become FloatToken or FloatType to get around this issue.