[PHP 8.0] Add trailing comma in parameter list

[PHP 8.0] Add exception witout variable

Support arbitrary expressions in new/instanceof

Treat magic constants like normal constants

Make class constants fully dereferencable

Unify array and object dereferencability

Split productions, unify {} dereferencing

Make encapsed strings fully dereferencable

Allow expressions in list()

Similar to the previous commit: list() syntactically accepts any
expression and non-variables are compile-time errors. The special
case of ($a) ends up be

Allow expressions in list()

Similar to the previous commit: list() syntactically accepts any
expression and non-variables are compile-time errors. The special
case of ($a) ends up being legal by accident.

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Allow expressions in isset()

Partial fix for #653. PHP 7 allows expressions inside isset(), but
rejects non-variables in the compiler. A side-effect of this is that
isset(($x)) is al

Allow expressions in isset()

Partial fix for #653. PHP 7 allows expressions inside isset(), but
rejects non-variables in the compiler. A side-effect of this is that
isset(($x)) is allowed, though this is not intentional.

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Place Nop nodes more precisely

If the Nop is created to collect comments, place it directly after
the comment, instead of at the next non-whitespace character.

Add support for union types

We definitely need to introduce a general "Type" abstraction in
the next major version.

Revert "Recover from error inside alternative array deref syntax"

This reverts commit 9d44edf85dc5882e45fed37a6c541bf20e7c8495.

Recover from error inside alternative array deref syntax

This is to improve error recovery for cases like #545.

Fix attributes for zero-length nop nodes

Previously zero-length nop nodes used the lookahead start attributes
and current end attributes. This choice ends up being somewhat weird,
be

Fix attributes for zero-length nop nodes

Previously zero-length nop nodes used the lookahead start attributes
and current end attributes. This choice ends up being somewhat weird,
because the end attributes will be the at the last non-whitespace,
non-comment token, which might be quite far back. More problematically,
we may not have encountered any non-discarded token if we're at the
start of the file, in which case we will have no end attributes to
assign.

Change things to use a canonical "zero-length" node representation,
where the end position (token & file) will be exactly one before the
start position.

Fixes #589.

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[PHP 7.4] Add array spread

[PHP 7.4] Add support for arrow functions (#602)

Per RFC https://wiki.php.net/rfc/arrow_functions_v2.

Add support for ??= operator

Introduced in PHP 5.4, represented using an AssignOp\Coalesce node.

Avoid redundant argument

Add PHP 7.4 typed properties support

add float/double/real KIND support to Cast\Double node

Avoid default action for error production

error is not necessarily going to have a semantic value, make sure
that the default action $$=$1 is not used.

Fixes #551.

Support error recovery for missing return type

The return type is set to "null" in this case.

Fixes #544.

Flexible doc: Validate end label indentation

Move doc string parsing logic from rebuildParsers.php and
String_::parseDocString() into ParserAbstract. This stuff is
going to get compl

Flexible doc: Validate end label indentation

Move doc string parsing logic from rebuildParsers.php and
String_::parseDocString() into ParserAbstract. This stuff is
going to get complicated now.

For now only implement the validation of the indentation on the
end label.

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Store comment at end of class in Nop statement

Fixed #509.