Support reserved keywords as enum cases

Fixes #807.

Don't make VariadicPlaceholder an expression

And don't store it in an Arg.

Add support for first-class callables

I'm somewhat unsure about the AST structure here.
VariadicPlaceholder is not a general expression. Maybe Arg->expr
should be Expr|VariadicPlaceh

Add support for first-class callables

I'm somewhat unsure about the AST structure here.
VariadicPlaceholder is not a general expression. Maybe Arg->expr
should be Expr|VariadicPlaceholder? Or possibly the call arguments
should be an array of Arg|VariadicPlaceholder?

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Add support for intersection types

Allow multiple modifiers for property promotion

Fixes issue #800.

Add support for new PHP 8.1 modifiers (#796)

Implement support for readonly properties (https://wiki.php.net/rfc/readonly_properties_v2) and
final class contstants (https://wiki.php.net/

Add support for new PHP 8.1 modifiers (#796)

Implement support for readonly properties (https://wiki.php.net/rfc/readonly_properties_v2) and
final class contstants (https://wiki.php.net/rfc/final_class_const).

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Add support for PHP 8.1

With the introduction of intersection types, PHP now lexes the
token '&' either as T_AMPERSAND_(NOT_)FOLLOWED_BY_VAR_OR_VARARG.
This completely breaks parsing

Add support for PHP 8.1

With the introduction of intersection types, PHP now lexes the
token '&' either as T_AMPERSAND_(NOT_)FOLLOWED_BY_VAR_OR_VARARG.
This completely breaks parsing of any code containing '&'.

Fix this by canonicalizing to the new token format (unconditionally,
independent of emulation) and adjusting the parser to use the two
new tokens.

This doesn't add actual support for intersection types yet.

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Fix precedence of arrow functions

Arrow functions should have lowest precedence.

Fixes #769.

[PHP 8.1] Add support for enums (#758)

RFC: https://wiki.php.net/rfc/enumerations

Co-authored-by: Nikita Popov <nikita.ppv@gmail.com>

Add emulation for enum keyword

Remove no longer necessary class parsing workaround

This was split to work around the attribute assignment bug fixed
in the previous commit, and as such is no longer necessary.

Fix #741 incorrect varvar positions

Recover from missing semicolon after property or class const

Fixes #712.

[PHP 8.0] Add attributes support (#661)

Adds support for PHP 8 attributes, represented using `AttrGroup` nodes
containing `Attribute` nodes. The `attrGroup` subnode is added to all
n

[PHP 8.0] Add attributes support (#661)

Adds support for PHP 8 attributes, represented using `AttrGroup` nodes
containing `Attribute` nodes. The `attrGroup` subnode is added to all
nodes that can have attributes.

This is still missing FPPP support.

Co-authored-by: Nikita Popov <nikita.ppv@gmail.com>

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Emulate PHP 8 attribute syntax

Perform emulation by replacing #[ with %[, then patching % back
to # and coalescing #[ into T_ATTRIBUTE if it is a freestanding
token.

Allow keywords in namespace declaration

Add support for throw expression

Add support for static return type

Add named argument support

Not adding any explicit FPPP support, as I don't think add/remove
of names can be handled any better than full reformatting.

Add support for nullsafe operator

Update php-yacc, remove unused tokens

Migrate grammar to use PHP 8 T_NAME_* tokens

This will break everything on PHP < 8.

[PHP 8.0] Support trailing comma in closure use list

RFC: https://wiki.php.net/rfc/trailing_comma_in_closure_use_list

[PHP 8.0] Add match expressions (#672)

RFC: https://wiki.php.net/rfc/match_expression_v2
Upstream implementation: php/php-src#5371

Closes #671.

Add constructor promotion support