Insertion of a nullable node
-----
<?php

// TODO: The result spacing isn't always optimal. We may want to skip whitespace in some cases.

function
foo(
$x,
&$y
)
{}

$foo
[
];

[
    $value
];

function
()
{};

$x
?
:
$y;

yield
$v  ;
yield  ;

break
;
continue
;
return
;

class
X
{
    public
    function y()
    {}

    private
        $x
    ;
}

foreach (
    $x
    as
    $y
) {}

static
$var
;

try {
} catch (X
$y) {
}
-----
$stmts[0]->returnType = new Node\Name('Foo');
$stmts[0]->params[0]->type = new Node\Identifier('int');
$stmts[0]->params[1]->type = new Node\Identifier('array');
$stmts[0]->params[1]->default = new Expr\ConstFetch(new Node\Name('null'));
$stmts[1]->expr->dim = new Expr\Variable('a');
$stmts[2]->expr->items[0]->key = new Scalar\String_('X');
$stmts[3]->expr->returnType = new Node\Name('Bar');
$stmts[4]->expr->if = new Expr\Variable('z');
$stmts[5]->expr->key = new Expr\Variable('k');
$stmts[6]->expr->value = new Expr\Variable('v');
$stmts[7]->num = new Scalar\LNumber(2);
$stmts[8]->num = new Scalar\LNumber(2);
$stmts[9]->expr = new Expr\Variable('x');
$stmts[10]->extends = new Node\Name\FullyQualified('Bar');
$stmts[10]->stmts[0]->returnType = new Node\Name('Y');
$stmts[10]->stmts[1]->props[0]->default = new Scalar\DNumber(42.0);
$stmts[11]->keyVar = new Expr\Variable('z');
$stmts[12]->vars[0]->default = new Scalar\String_('abc');
$stmts[13]->finally = new Stmt\Finally_([]);
-----
<?php

// TODO: The result spacing isn't always optimal. We may want to skip whitespace in some cases.

function
foo(
int $x,
array &$y = null
) : Foo
{}

$foo
[$a
];

[
    'X' => $value
];

function
() : Bar
{};

$x
? $z
:
$y;

yield $k =>
$v  ;
yield $v  ;

break 2
;
continue 2
;
return $x
;

class
X extends \Bar
{
    public
    function y() : Y
    {}

    private
        $x = 42.0
    ;
}

foreach (
    $x
    as $z =>
    $y
) {}

static
$var = 'abc'
;

try {
} catch (X
$y) {
} finally {
}
-----
<?php

namespace
{ echo 42; }
-----
$stmts[0]->name = new Node\Name('Foo');
-----
<?php

namespace Foo
{ echo 42; }