Support changes in php 8.0 syntax?

[TysonAndre]

The following changes may matter for the language specification in PHP 8.0 - feel free to split out separate tickets

https://wiki.php.net/rfc/named_params
https://wiki.php.net/rfc/namespaced_names_as_token
https://wiki.php.net/rfc/nullsafe_operator
https://wiki.php.net/rfc/match_expression_v2
https://wiki.php.net/rfc/non-capturing_catches
Trailing commas in parameters/closure use
https://wiki.php.net/rfc/union_types_v2
https://wiki.php.net/rfc/static_return_type
https://wiki.php.net/rfc/mixed_type_v2

Additionally, the php 8.0 attributes syntax is still being voted on

[azjezz]

list for PHP 8.1 & 8.2 syntax:

• intersection types
• enums
• array unpacking with string keys
• explicit octal notation
• never return type
• final class constants
• new in initializers
• first class callable syntax
• readonly properties
• false & null standalone types
• readonly classes