[8.4] Add support for new deref without parens

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

Avoid cyclic reference in parser

Pass $this as an explicit $self argument to the reduce callbacks,
so we can make them static. This avoids a circular reference in
the parser, so that

Avoid cyclic reference in parser

Pass $this as an explicit $self argument to the reduce callbacks,
so we can make them static. This avoids a circular reference in
the parser, so that it can be immediately destroyed when it goes
out of scope.

Fixes #980.

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Don't drop class statements before error (#952)

When encountering a null statement (indicating that an error occurred),
retain the preceding statements. These were accidentally dropped

Don't drop class statements before error (#952)

When encountering a null statement (indicating that an error occurred),
retain the preceding statements. These were accidentally dropped
previously.

(cherry picked from commit 54103d838734be0499172026525e38cbf6af2711)

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Remove Stmt\Throw

This was a backwards-compatibility shim for Expr\Throw.

Introduce Stmt\Block

Stmt\Block will be created for { $a; } style blocks, unless these
occur directly inside some structure that is usually combined
with a block.

For exampl

Introduce Stmt\Block

Stmt\Block will be created for { $a; } style blocks, unless these
occur directly inside some structure that is usually combined
with a block.

For example if ($a) { $b; } will continue to use the old
representation (plain array in in If_::$stmts), but a free-standing
{ $b; } will become a Stmt\Block.

Fixes #590.

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Add rawValue to InterpolatedStringPart and doc strings

For doc strings, the rawValue (on either the String_ or
InterpolatedStringPrts) does not include the leading indentation
(which

Add rawValue to InterpolatedStringPart and doc strings

For doc strings, the rawValue (on either the String_ or
InterpolatedStringPrts) does not include the leading indentation
(which is available as docIndentation) or the trailing newline on
the last part.

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Don't parse unicode escapes for PHP < 7.0

We still had the option for this but were hardcoding it to true.
Make it conditional on the PHP version instead.

Add property types

Types omitted in two places where we violate them currently:
Namespace_::$stmts can be null during parsing, and Enum_::$scalarType
can be a complex type for invali

Add property types

Types omitted in two places where we violate them currently:
Namespace_::$stmts can be null during parsing, and Enum_::$scalarType
can be a complex type for invalid programs.

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Move attribute handling into parser

The Lexer now only provides the tokens to the parser, while the
parser is responsible for determining which attributes are placed
on notes. This o

Move attribute handling into parser

The Lexer now only provides the tokens to the parser, while the
parser is responsible for determining which attributes are placed
on notes. This only needs to be done when the attributes are
actually needed, rather than for all tokens.

This removes the usedAttributes lexer option (and lexer options
entirely). The attributes are now enabled unconditionally. They
have less overhead now, and the need to explicitly enable them for
some use cases (e.g. formatting-preserving printing) doesn't seem
like a good tradeoff anymore.

There are some additional changes to the Lexer interface that
should be done after this, and the docs / upgrading guide haven't
been adjusted yet.

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Make use of default actions

For the default action $$ = $1, save the closure invocation.

Support readonly anonymous classes

Add support for typed constants

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

Produce error if <?= used as identifier

Due to a peculiarity of how <?= is handled, it can get treated as
an echo identifier. Make sure it isn't, to match PHP behavior.

Remove __halt_compiler from semi reserved keyword list

Apparently PHP does not allow use of __halt_compiler as a
semi-reserved keyword.

[PHP 8.3] Support dynamic class const fetch

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

Support readonly before DNF type

This makes us match the PHP 8.2 handling of readonly. Handling of
"readonly" functions is moved to the parser to allow distinguishing
them from reado

Support readonly before DNF type

This makes us match the PHP 8.2 handling of readonly. Handling of
"readonly" functions is moved to the parser to allow distinguishing
them from readonly properties with DNF types. We have to uglify the
grammar to avoid some shift/reduce conflicts. Thank you WordPress.

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Add missing return types

Fix formatting preservation for alternative elseif/else syntax

Test taken from PR #797.

Fix some phpstan warnings

Use Node\ClosureUse instead of Expr\ClosureUse in parser

Fixes #883.

Rename Stmt\UseUse to UseItem

Rename Stmt\PropertyProperty to PropertyItem

Rename Stmt\DeclareDeclare to DeclareItem

Rename Scalar\Encapsed to Scalar\InterpolatedString

Rename Scalar\EncapsedStringPart to InterpolatedStringPart

It is no longer an expression node, which unfortunately does
require a more awkward type for the Encaps node.