conflicting test

tests/Issues/CallableFixture/class_with_nullable_callable.php.inc

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+<?php
+
+namespace Rector\Tests\Issues\CallableFixture;
+
+final class StyleWithCallable implements InterfaceWithCallable
+{
+    public function ask($id = null)
+    {
+    }
+}
+
+interface InterfaceWithCallable
+{
+    public function ask(callable $id = null);
+}
+
+?>
+-----
+<?php
+
+namespace Rector\Tests\Issues\CallableFixture;
+
+final class StyleWithCallable implements InterfaceWithCallable
+{
+    public function ask($id = null)
+    {
+    }
+}
+
+interface InterfaceWithCallable
+{
+    /**
+     * @param callable|null $id
+     */
+    public function ask($id = null);
+}
+
+?>

tests/Issues/CallableInterfaceDowngradeTest.php

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+<?php
+
+declare(strict_types=1);
+
+namespace Rector\Core\Tests\Issues;
+
+use Iterator;
+use Rector\Testing\PHPUnit\AbstractRectorTestCase;
+use Symplify\SmartFileSystem\SmartFileInfo;
+
+final class CallableInterfaceDowngradeTest extends AbstractRectorTestCase
+{
+    /**
+     * @dataProvider provideData()
+     */
+    public function test(SmartFileInfo $fileInfo): void
+    {
+        $this->doTestFileInfo($fileInfo);
+    }
+
+    /**
+     * @return Iterator<SmartFileInfo>
+     */
+    public function provideData(): Iterator
+    {
+        return $this->yieldFilesFromDirectory(__DIR__ . '/CallableFixture');
+    }
+
+    public function provideConfigFilePath(): string
+    {
+        return __DIR__ . '/config/callable_interface_downgrade.php';
+    }
+}

tests/Issues/config/callable_interface_downgrade.php

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+<?php
+
+declare(strict_types=1);
+
+use Rector\DowngradePhp70\Rector\FunctionLike\DowngradeScalarTypeDeclarationRector;
+use Rector\DowngradePhp71\Rector\FunctionLike\DowngradeNullableTypeDeclarationRector;
+use Symfony\Component\DependencyInjection\Loader\Configurator\ContainerConfigurator;
+
+return static function (ContainerConfigurator $containerConfigurator): void {
+    $services = $containerConfigurator->services();
+    $services->set(DowngradeNullableTypeDeclarationRector::class);
+    $services->set(DowngradeScalarTypeDeclarationRector::class);
+};