Add missing phpdoc annotations in AST nodes (#946)

Remove superfluous phpdoc tags

These just specify a type that is already specified as a real PHP
type.

Add more property types

Some of these are not maximally accurate due to lack of union
types.

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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Stop accepting strings as types

For types the use of a string is ambiguous -- it could be either
an Identifier or a Name. Don't guess.

Retain the implicit promotion to Identifie

Stop accepting strings as types

For types the use of a string is ambiguous -- it could be either
an Identifier or a Name. Don't guess.

Retain the implicit promotion to Identifier in places where only
Identifier is legal, e.g. various symbol names.

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Specify more types

Use array<string, mixed> type for $attributes

Slightly more accurate, and stops PHPStan from complaining about
the missing array type information.

Add php-cs-fixer config and reformat

The formatting in this project has become something of a mess,
because it changed over time. Add a CS fixer config and reformat
to the desired st

Add php-cs-fixer config and reformat

The formatting in this project has become something of a mess,
because it changed over time. Add a CS fixer config and reformat
to the desired style, which is PSR-12, but with sane brace placement.

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Fixed ArrowFunction::$expr

Introduce ComplexType base class

With the upcoming addition of intersection types, a type can
be Identifier|Name|NullableType|UnionType|IntersectionType, which
is quite the mouthful.

Introduce ComplexType base class

With the upcoming addition of intersection types, a type can
be Identifier|Name|NullableType|UnionType|IntersectionType, which
is quite the mouthful. Give NullableType and UnionType a common
base class ComplexType, which does not have any behavior, but
allows to write these types (and check them in instanceof) more
easily.

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[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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Add support for union types

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

Avoid parent constructor call during node construction

Instead explicitly assign the attributes. This is a minor
performance improvement.

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

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