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Edit File: CallableTypeParameterNode.php

<?php declare(strict_types = 1);

namespace PHPStan\PhpDocParser\Ast\Type;

use PHPStan\PhpDocParser\Ast\Node;
use PHPStan\PhpDocParser\Ast\NodeAttributes;
use function trim;

class CallableTypeParameterNode implements Node
{

use NodeAttributes;

/** @var TypeNode */
	public $type;

/** @var bool */
	public $isReference;

/** @var bool */
	public $isVariadic;

/** @var string (may be empty) */
	public $parameterName;

/** @var bool */
	public $isOptional;

public function __construct(TypeNode $type, bool $isReference, bool $isVariadic, string $parameterName, bool $isOptional)
	{
		$this->type = $type;
		$this->isReference = $isReference;
		$this->isVariadic = $isVariadic;
		$this->parameterName = $parameterName;
		$this->isOptional = $isOptional;
	}

public function __toString(): string
	{
		$type = "{$this->type} ";
		$isReference = $this->isReference ? '&' : '';
		$isVariadic = $this->isVariadic ? '...' : '';
		$isOptional = $this->isOptional ? '=' : '';
		return trim("{$type}{$isReference}{$isVariadic}{$this->parameterName}") . $isOptional;
	}

}

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