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Edit File: YieldInGeneratorRule.php

<?php declare(strict_types = 1);

namespace PHPStan\Rules\Generators;

use PhpParser\Node;
use PHPStan\Analyser\Scope;
use PHPStan\Reflection\ParametersAcceptorSelector;
use PHPStan\Rules\Rule;
use PHPStan\TrinaryLogic;
use PHPStan\Type\ArrayType;
use PHPStan\Type\MixedType;

class YieldInGeneratorRule implements Rule
{

/** @var bool */
	private $reportMaybes;

public function __construct(bool $reportMaybes)
	{
		$this->reportMaybes = $reportMaybes;
	}

public function getNodeType(): string
	{
		return Node\Expr::class;
	}

/**
	 * @param Node\Expr $node
	 * @param Scope $scope
	 * @return string[]
	 */
	public function processNode(Node $node, Scope $scope): array
	{
		if (!$node instanceof Node\Expr\Yield_ && !$node instanceof Node\Expr\YieldFrom) {
			return [];
		}

$anonymousFunctionReturnType = $scope->getAnonymousFunctionReturnType();
		$scopeFunction = $scope->getFunction();
		if ($anonymousFunctionReturnType !== null) {
			$returnType = $anonymousFunctionReturnType;
		} elseif ($scopeFunction !== null) {
			$returnType = ParametersAcceptorSelector::selectSingle($scopeFunction->getVariants())->getReturnType();
		} else {
			return [
				'Yield can be used only inside a function.',
			];
		}

if ($returnType instanceof MixedType) {
			return [];
		}

$isSuperType = $returnType->isIterable()->and(TrinaryLogic::createFromBoolean(
			$returnType instanceof ArrayType
		)->negate());
		if ($isSuperType->yes()) {
			return [];
		}

if ($isSuperType->maybe() && !$this->reportMaybes) {
			return [];
		}

return [
			sprintf(
				'Yield can be used only with these return types: %s.',
				'Generator, Iterator, Traversable, iterable'
			),
		];
	}

}