diff --git a/src/Illuminate/Collections/Arr.php b/src/Illuminate/Collections/Arr.php
index ac2642c67cd3..87ec3fe1955c 100644
--- a/src/Illuminate/Collections/Arr.php
+++ b/src/Illuminate/Collections/Arr.php
@@ -845,7 +845,9 @@ public static function where($array, callable $callback)
      */
     public static function whereNotNull($array)
     {
-        return static::where($array, fn ($value) => ! is_null($value));
+        return static::where($array, function ($value) {
+            return ! is_null($value);
+        });
     }
 
     /**
diff --git a/src/Illuminate/Collections/Collection.php b/src/Illuminate/Collections/Collection.php
index 76fe09f1b931..91b92bd4734d 100644
--- a/src/Illuminate/Collections/Collection.php
+++ b/src/Illuminate/Collections/Collection.php
@@ -85,9 +85,11 @@ public function avg($callback = null)
     {
         $callback = $this->valueRetriever($callback);
 
-        $items = $this
-            ->map(fn ($value) => $callback($value))
-            ->filter(fn ($value) => ! is_null($value));
+        $items = $this->map(function ($value) use ($callback) {
+            return $callback($value);
+        })->filter(function ($value) {
+            return ! is_null($value);
+        });
 
         if ($count = $items->count()) {
             return $items->sum() / $count;
@@ -353,10 +355,14 @@ public function duplicatesStrict($callback = null)
     protected function duplicateComparator($strict)
     {
         if ($strict) {
-            return fn ($a, $b) => $a === $b;
+            return function ($a, $b) {
+                return $a === $b;
+            };
         }
 
-        return fn ($a, $b) => $a == $b;
+        return function ($a, $b) {
+            return $a == $b;
+        };
     }
 
     /**
@@ -1159,7 +1165,9 @@ public function sliding($size = 2, $step = 1)
     {
         $chunks = floor(($this->count() - $size) / $step) + 1;
 
-        return static::times($chunks, fn ($number) => $this->slice(($number - 1) * $step, $size));
+        return static::times($chunks, function ($number) use ($size, $step) {
+            return $this->slice(($number - 1) * $step, $size);
+        });
     }
 
     /**
@@ -1640,9 +1648,13 @@ public function values()
      */
     public function zip($items)
     {
-        $arrayableItems = array_map(fn ($items) => $this->getArrayableItems($items), func_get_args());
+        $arrayableItems = array_map(function ($items) {
+            return $this->getArrayableItems($items);
+        }, func_get_args());
 
-        $params = array_merge([fn () => new static(func_get_args()), $this->items], $arrayableItems);
+        $params = array_merge([function () {
+            return new static(func_get_args());
+        }, $this->items], $arrayableItems);
 
         return new static(array_map(...$params));
     }
diff --git a/src/Illuminate/Collections/LazyCollection.php b/src/Illuminate/Collections/LazyCollection.php
index 8aa7cf1a302d..c22da245d31c 100644
--- a/src/Illuminate/Collections/LazyCollection.php
+++ b/src/Illuminate/Collections/LazyCollection.php
@@ -433,7 +433,9 @@ public function except($keys)
     public function filter(callable $callback = null)
     {
         if (is_null($callback)) {
-            $callback = fn ($value) => (bool) $value;
+            $callback = function ($value) {
+                return (bool) $value;
+            };
         }
 
         return new static(function () use ($callback) {
@@ -1519,7 +1521,9 @@ public function takeWhile($value)
         /** @var callable(TValue, TKey): bool $callback */
         $callback = $this->useAsCallable($value) ? $value : $this->equality($value);
 
-        return $this->takeUntil(fn ($item, $key) => ! $callback($item, $key));
+        return $this->takeUntil(function ($item, $key) use ($callback) {
+            return ! $callback($item, $key);
+        });
     }
 
     /**
diff --git a/src/Illuminate/Console/Scheduling/CacheEventMutex.php b/src/Illuminate/Console/Scheduling/CacheEventMutex.php
index 76036835310c..836c23cef3b4 100644
--- a/src/Illuminate/Console/Scheduling/CacheEventMutex.php
+++ b/src/Illuminate/Console/Scheduling/CacheEventMutex.php
@@ -62,7 +62,7 @@ public function exists(Event $event)
         if ($this->cache->store($this->store)->getStore() instanceof LockProvider) {
             return ! $this->cache->store($this->store)->getStore()
                 ->lock($event->mutexName(), $event->expiresAt * 60)
-                ->get(fn () => true);
+                ->get(function () { return true; });
         }
 
         return $this->cache->store($this->store)->has($event->mutexName());
diff --git a/src/Illuminate/Database/Console/Migrations/StatusCommand.php b/src/Illuminate/Database/Console/Migrations/StatusCommand.php
index 9b49633028d9..dc505ac6b954 100644
--- a/src/Illuminate/Database/Console/Migrations/StatusCommand.php
+++ b/src/Illuminate/Database/Console/Migrations/StatusCommand.php
@@ -66,11 +66,15 @@ public function handle()
                 $this->components->twoColumnDetail('<fg=gray>Migration name</>', '<fg=gray>Batch / Status</>');
 
                 $migrations
-                    ->when($this->option('pending'), fn ($collection) => $collection->filter(function ($migration) {
-                        return str($migration[1])->contains('Pending');
-                    }))
+                    ->when($this->option('pending'), function ($collection) {
+                        return $collection->filter(function ($migration) {
+                            return str($migration[1])->contains('Pending');
+                        });
+                    })
                     ->each(
-                        function ($migration) { return $this->components->twoColumnDetail($migration[0], $migration[1]); }
+                        function ($migration) {
+                            return $this->components->twoColumnDetail($migration[0], $migration[1]);
+                        }
                     );
 
                 $this->newLine();
diff --git a/src/Illuminate/Database/Eloquent/Model.php b/src/Illuminate/Database/Eloquent/Model.php
index 6b61a14acc55..9497ac29ea50 100644
--- a/src/Illuminate/Database/Eloquent/Model.php
+++ b/src/Illuminate/Database/Eloquent/Model.php
@@ -1100,7 +1100,9 @@ public function push()
      */
     public function pushQuietly()
     {
-        return static::withoutEvents(fn () => $this->push());
+        return static::withoutEvents(function () {
+            return $this->push();
+        });
     }
 
     /**
diff --git a/src/Illuminate/Database/Eloquent/Relations/HasOneOrMany.php b/src/Illuminate/Database/Eloquent/Relations/HasOneOrMany.php
index a514443562fd..a1e06896fc69 100644
--- a/src/Illuminate/Database/Eloquent/Relations/HasOneOrMany.php
+++ b/src/Illuminate/Database/Eloquent/Relations/HasOneOrMany.php
@@ -375,9 +375,13 @@ public function createMany(/*iterable */$records)
      * @param  iterable  $records
      * @return \Illuminate\Database\Eloquent\Collection
      */
-    public function createManyQuietly(iterable $records)
+    public function createManyQuietly(/*iterable */$records)
     {
-        return Model::withoutEvents(fn () => $this->createMany($records));
+        $records = backport_type_check('iterable', $records);
+
+        return Model::withoutEvents(function () use ($records) {
+            return $this->createMany($records);
+        });
     }
 
     /**
diff --git a/src/Illuminate/Database/Migrations/Migrator.php b/src/Illuminate/Database/Migrations/Migrator.php
index c1d56e27addb..e12652a036ed 100644
--- a/src/Illuminate/Database/Migrations/Migrator.php
+++ b/src/Illuminate/Database/Migrations/Migrator.php
@@ -528,7 +528,10 @@ protected function resolvePath(/*string */$path)
             return new $class;
         }
 
-        $migration = static::$requiredPathCache[$path] ??= $this->files->getRequire($path);
+        if (! isset(static::$requiredPathCache[$path])) {
+            static::$requiredPathCache[$path] = $this->files->getRequire($path);
+        }
+        $migration = static::$requiredPathCache[$path];
 
         if (is_object($migration)) {
             return clone $migration;
diff --git a/src/Illuminate/Database/Query/Grammars/MySqlGrammar.php b/src/Illuminate/Database/Query/Grammars/MySqlGrammar.php
index 325a5dd6a8e9..35fe746e3d22 100644
--- a/src/Illuminate/Database/Query/Grammars/MySqlGrammar.php
+++ b/src/Illuminate/Database/Query/Grammars/MySqlGrammar.php
@@ -83,11 +83,11 @@ public function whereFullText(Builder $query, $where)
      */
     protected function compileIndexHint(Builder $query, $indexHint)
     {
-        return match ($indexHint->type) {
-            'hint' => "use index ({$indexHint->index})",
-            'force' => "force index ({$indexHint->index})",
-            default => "ignore index ({$indexHint->index})",
-        };
+        switch ($indexHint->type) {
+            case 'hint': return "use index ({$indexHint->index})";
+            case 'force': return "force index ({$indexHint->index})";
+            default:  return "ignore index ({$indexHint->index})";
+        }
     }
 
     /**
diff --git a/src/Illuminate/Foundation/Exceptions/Handler.php b/src/Illuminate/Foundation/Exceptions/Handler.php
index cdc8e0e41562..46ad527e7fbb 100644
--- a/src/Illuminate/Foundation/Exceptions/Handler.php
+++ b/src/Illuminate/Foundation/Exceptions/Handler.php
@@ -320,11 +320,15 @@ protected function shouldntReport(/*Throwable */$e)
      */
     public function stopIgnoring(string $exception)
     {
+        $exception = backport_type_check('string', $exception);
+
         $this->dontReport = collect($this->dontReport)
-                ->reject(fn ($ignored) => $ignored === $exception)->values()->all();
+                ->reject(function ($ignored) use ($exception) { return $ignored === $exception; })
+                ->values()->all();
 
         $this->internalDontReport = collect($this->internalDontReport)
-                ->reject(fn ($ignored) => $ignored === $exception)->values()->all();
+                ->reject(function ($ignored) use ($exception) { return $ignored === $exception; })
+                ->values()->all();
 
         return $this;
     }
diff --git a/src/Illuminate/Foundation/Testing/DatabaseTruncation.php b/src/Illuminate/Foundation/Testing/DatabaseTruncation.php
index 45ab6a6c3f7f..5483a312c749 100644
--- a/src/Illuminate/Foundation/Testing/DatabaseTruncation.php
+++ b/src/Illuminate/Foundation/Testing/DatabaseTruncation.php
@@ -90,11 +90,11 @@ protected function truncateTablesForConnection(ConnectionInterface $connection,
         collect(static::$allTables[$name])
             ->when(
                 property_exists($this, 'tablesToTruncate'),
-                fn ($tables) => $tables->intersect($this->tablesToTruncate),
-                fn ($tables) => $tables->diff($this->exceptTables($name))
+                function ($tables) { return $tables->intersect($this->tablesToTruncate); },
+                function ($tables) { return $tables->diff($this->exceptTables($name)); }
             )
-            ->filter(fn ($table) => $connection->table($table)->exists())
-            ->each(fn ($table) => $connection->table($table)->truncate());
+            ->filter(function ($table) use ($connection) { return $connection->table($table)->exists(); })
+            ->each(function ($table) use ($connection) { return $connection->table($table)->truncate(); });
 
         $connection->setEventDispatcher($dispatcher);
     }
diff --git a/src/Illuminate/Mail/MailManager.php b/src/Illuminate/Mail/MailManager.php
index 6e286ca22d36..c862a901a9b8 100644
--- a/src/Illuminate/Mail/MailManager.php
+++ b/src/Illuminate/Mail/MailManager.php
@@ -283,7 +283,7 @@ protected function createSesV2Transport(array $config)
 
         return new SesV2Transport(
             new SesV2Client($this->addSesCredentials($config)),
-            $config['options'] ?? []
+            isset($config['options']) ? $config['options'] : []
         );
     }
 
diff --git a/src/Illuminate/Mail/Transport/SesTransport.php b/src/Illuminate/Mail/Transport/SesTransport.php
index cd7192a23c8b..bb4e7a000a93 100644
--- a/src/Illuminate/Mail/Transport/SesTransport.php
+++ b/src/Illuminate/Mail/Transport/SesTransport.php
@@ -151,7 +151,8 @@ public function setOptions(array $options)
      *
      * @return string
      */
-    public function __toString(): string
+    #[\ReturnTypeWillChange]
+    public function __toString()/*: string*/
     {
         return 'ses';
     }
diff --git a/src/Illuminate/Mail/Transport/SesV2Transport.php b/src/Illuminate/Mail/Transport/SesV2Transport.php
index 4157570e5bd0..ccc761f62c33 100644
--- a/src/Illuminate/Mail/Transport/SesV2Transport.php
+++ b/src/Illuminate/Mail/Transport/SesV2Transport.php
@@ -44,7 +44,7 @@ public function __construct(SesV2Client $ses, $options = [])
     /**
      * {@inheritDoc}
      */
-    protected function doSend(SentMessage $message): void
+    protected function doSend(SentMessage $message)/*: void*/
     {
         $options = $this->options;
 
@@ -77,7 +77,9 @@ protected function doSend(SentMessage $message): void
                 )
             );
         } catch (AwsException $e) {
-            $reason = $e->getAwsErrorMessage() ?? $e->getMessage();
+            $awsReason = $e->getAwsErrorMessage();
+
+            $reason = isset($awsReason) ? $awsReason : $e->getMessage();
 
             throw new Exception(
                 sprintf('Request to AWS SES V2 API failed. Reason: %s.', $reason),
@@ -128,7 +130,8 @@ public function setOptions(array $options)
      *
      * @return string
      */
-    public function __toString(): string
+    #[\ReturnTypeWillChange]
+    public function __toString()/*: string*/
     {
         return 'ses-v2';
     }
diff --git a/src/Illuminate/Support/Str.php b/src/Illuminate/Support/Str.php
index 2338faa823c1..3124ef2f9de4 100644
--- a/src/Illuminate/Support/Str.php
+++ b/src/Illuminate/Support/Str.php
@@ -738,23 +738,27 @@ public static function pluralStudly($value, $count = 2)
     public static function password($length = 32, $letters = true, $numbers = true, $symbols = true, $spaces = false)
     {
         return (new Collection)
-                ->when($letters, fn ($c) => $c->merge([
+                ->when($letters, function ($c) { return $c->merge([
                     'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'i', 'j', 'k',
                     'l', 'm', 'n', 'o', 'p', 'q', 'r', 's', 't', 'u', 'v',
                     'w', 'x', 'y', 'z', 'A', 'B', 'C', 'D', 'E', 'F', 'G',
                     'H', 'I', 'J', 'K', 'L', 'M', 'N', 'O', 'P', 'Q', 'R',
                     'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z',
-                ]))
-                ->when($numbers, fn ($c) => $c->merge([
+                ]); })
+                ->when($numbers, function ($c) { return $c->merge([
                     '0', '1', '2', '3', '4', '5', '6', '7', '8', '9',
-                ]))
-                ->when($symbols, fn ($c) => $c->merge([
+                ]); })
+                ->when($symbols, function ($c) { return $c->merge([
                     '~', '!', '#', '$', '%', '^', '&', '*', '(', ')', '-',
                     '_', '.', ',', '<', '>', '?', '/', '\\', '{', '}', '[',
                     ']', '|', ':', ';',
-                ]))
-                ->when($spaces, fn ($c) => $c->merge([' ']))
-                ->pipe(fn ($c) => Collection::times($length, fn () => $c[random_int(0, $c->count() - 1)]))
+                ]); })
+                ->when($spaces, function ($c) { return $c->merge([' ']); })
+                ->pipe(function ($c) use ($length) {
+                    return Collection::times($length, function () use ($c) {
+                        return $c[random_int(0, $c->count() - 1)];
+                    });
+                })
                 ->implode('');
     }
 
diff --git a/src/Illuminate/Support/Testing/Fakes/BusFake.php b/src/Illuminate/Support/Testing/Fakes/BusFake.php
index a5ee1e0afce0..eca30f6f4454 100644
--- a/src/Illuminate/Support/Testing/Fakes/BusFake.php
+++ b/src/Illuminate/Support/Testing/Fakes/BusFake.php
@@ -136,7 +136,7 @@ public function assertDispatchedTimes($command, $times = 1)
         $callback = null;
 
         if ($command instanceof Closure) {
-            [$command, $callback] = [$this->firstClosureParameterType($command), $command];
+            list($command, $callback) = [$this->firstClosureParameterType($command), $command];
         }
 
         $count = $this->dispatched($command, $callback)->count() +
@@ -215,7 +215,7 @@ public function assertDispatchedSyncTimes($command, $times = 1)
         $callback = null;
 
         if ($command instanceof Closure) {
-            [$command, $callback] = [$this->firstClosureParameterType($command), $command];
+            list($command, $callback) = [$this->firstClosureParameterType($command), $command];
         }
 
         $count = $this->dispatchedSync($command, $callback)->count();
@@ -280,7 +280,7 @@ public function assertDispatchedAfterResponseTimes($command, $times = 1)
         $callback = null;
 
         if ($command instanceof Closure) {
-            [$command, $callback] = [$this->firstClosureParameterType($command), $command];
+            list($command, $callback) = [$this->firstClosureParameterType($command), $command];
         }
 
         $count = $this->dispatchedAfterResponse($command, $callback)->count();
diff --git a/src/Illuminate/Translation/MessageSelector.php b/src/Illuminate/Translation/MessageSelector.php
index 263716552347..cecc095f9d87 100644
--- a/src/Illuminate/Translation/MessageSelector.php
+++ b/src/Illuminate/Translation/MessageSelector.php
@@ -90,7 +90,9 @@ private function extractFromString($part, $number)
     private function stripConditions($segments)
     {
         return collect($segments)
-            ->map(fn ($part) => preg_replace('/^[\{\[]([^\[\]\{\}]*)[\}\]]/', '', $part))
+            ->map(function ($part) {
+                return preg_replace('/^[\{\[]([^\[\]\{\}]*)[\}\]]/', '', $part);
+            })
             ->all();
     }
 
diff --git a/tests/Foundation/FoundationApplicationTest.php b/tests/Foundation/FoundationApplicationTest.php
index 71ab1e821e23..16371395f43d 100644
--- a/tests/Foundation/FoundationApplicationTest.php
+++ b/tests/Foundation/FoundationApplicationTest.php
@@ -526,7 +526,7 @@ public function testMacroable()/*: void*/
     }
 
     /** @test */
-    public function testUseConfigPath(): void
+    public function testUseConfigPath()/*: void*/
     {
         $app = new Application;
         $app->useConfigPath(__DIR__.'/fixtures/config');
diff --git a/tests/Foundation/FoundationInteractsWithDatabaseTest.php b/tests/Foundation/FoundationInteractsWithDatabaseTest.php
index 7f839e31969a..8253af032953 100644
--- a/tests/Foundation/FoundationInteractsWithDatabaseTest.php
+++ b/tests/Foundation/FoundationInteractsWithDatabaseTest.php
@@ -16,6 +16,7 @@
 
 class FoundationInteractsWithDatabaseTest_testExpectsDatabaseQueryCount_class_1 extends TestingTestCase
         {
+            use \PHPUnit\Framework\PhpUnit8Assert;
             use CreatesApplication;
 
             public function testExpectsDatabaseQueryCount()
@@ -26,6 +27,7 @@ public function testExpectsDatabaseQueryCount()
 
 class FoundationInteractsWithDatabaseTest_testExpectsDatabaseQueryCount_class_2 extends TestingTestCase
         {
+            use \PHPUnit\Framework\PhpUnit8Assert;
             use CreatesApplication;
 
             public function testExpectsDatabaseQueryCount()
@@ -36,6 +38,7 @@ public function testExpectsDatabaseQueryCount()
 
 class FoundationInteractsWithDatabaseTest_testExpectsDatabaseQueryCount_class_3 extends TestingTestCase
         {
+            use \PHPUnit\Framework\PhpUnit8Assert;
             use CreatesApplication;
 
             public function testExpectsDatabaseQueryCount()
diff --git a/tests/Integration/Events/EventFakeTest.php b/tests/Integration/Events/EventFakeTest.php
index 2b225d7c030e..fc56e1756d7a 100644
--- a/tests/Integration/Events/EventFakeTest.php
+++ b/tests/Integration/Events/EventFakeTest.php
@@ -176,7 +176,7 @@ public function testAssertListening()
 
     public function testMissingMethodsAreForwarded()
     {
-        Event::macro('foo', fn () => 'bar');
+        Event::macro('foo', function () { return 'bar'; });
 
         $this->assertEquals('bar', Event::fake()->foo());
     }
diff --git a/tests/Mail/MailMailerTest.php b/tests/Mail/MailMailerTest.php
index 389adbacd86e..73e9d482f57f 100644
--- a/tests/Mail/MailMailerTest.php
+++ b/tests/Mail/MailMailerTest.php
@@ -33,7 +33,7 @@ public function testMailerSendSendsMessageWithProperViewContent()
         $message = m::mock(Swift_Mime_SimpleMessage::class);
         $mailer->expects($this->once())->method('createMessage')->willReturn($message);
         $view = m::mock(stdClass::class);
-        $mailer->getViewFactory()->shouldReceive('make')->once()->with('foo', ['data', 'message' => $message])->andReturn($view);
+        $mailer->getViewFactory()->shouldReceive('make')->once()->with('foo', ['data', 'mailer' => 'smtp', 'message' => $message])->andReturn($view);
         $view->shouldReceive('render')->once()->andReturn('rendered.view');
         $message->shouldReceive('setBody')->once()->with('rendered.view', 'text/html');
         $message->shouldReceive('setFrom')->never();
@@ -121,8 +121,8 @@ public function testMailerSendSendsMessageWithProperPlainViewContent()
         $message = m::mock(Swift_Mime_SimpleMessage::class);
         $mailer->expects($this->once())->method('createMessage')->willReturn($message);
         $view = m::mock(stdClass::class);
-        $mailer->getViewFactory()->shouldReceive('make')->once()->with('foo', ['data', 'message' => $message])->andReturn($view);
-        $mailer->getViewFactory()->shouldReceive('make')->once()->with('bar', ['data', 'message' => $message])->andReturn($view);
+        $mailer->getViewFactory()->shouldReceive('make')->once()->with('foo', ['data', 'mailer' => 'smtp', 'message' => $message])->andReturn($view);
+        $mailer->getViewFactory()->shouldReceive('make')->once()->with('bar', ['data', 'mailer' => 'smtp', 'message' => $message])->andReturn($view);
         $view->shouldReceive('render')->twice()->andReturn('rendered.view');
         $message->shouldReceive('setBody')->once()->with('rendered.view', 'text/html');
         $message->shouldReceive('addPart')->once()->with('rendered.view', 'text/plain');
@@ -143,8 +143,8 @@ public function testMailerSendSendsMessageWithProperPlainViewContentWhenExplicit
         $message = m::mock(Swift_Mime_SimpleMessage::class);
         $mailer->expects($this->once())->method('createMessage')->willReturn($message);
         $view = m::mock(stdClass::class);
-        $mailer->getViewFactory()->shouldReceive('make')->once()->with('foo', ['data', 'message' => $message])->andReturn($view);
-        $mailer->getViewFactory()->shouldReceive('make')->once()->with('bar', ['data', 'message' => $message])->andReturn($view);
+        $mailer->getViewFactory()->shouldReceive('make')->once()->with('foo', ['data', 'mailer' => 'smtp', 'message' => $message])->andReturn($view);
+        $mailer->getViewFactory()->shouldReceive('make')->once()->with('bar', ['data', 'mailer' => 'smtp', 'message' => $message])->andReturn($view);
         $view->shouldReceive('render')->twice()->andReturn('rendered.view');
         $message->shouldReceive('setBody')->once()->with('rendered.view', 'text/html');
         $message->shouldReceive('addPart')->once()->with('rendered.view', 'text/plain');
diff --git a/tests/Mail/MailSesV2TransportTest.php b/tests/Mail/MailSesV2TransportTest.php
index 692ab537917a..93c8eba03f0c 100755
--- a/tests/Mail/MailSesV2TransportTest.php
+++ b/tests/Mail/MailSesV2TransportTest.php
@@ -15,7 +15,7 @@
 
 class MailSesV2TransportTest extends TestCase
 {
-    protected function tearDown(): void
+    protected function tearDown()/*: void*/
     {
         m::close();
 
@@ -24,6 +24,8 @@ protected function tearDown(): void
 
     public function testGetTransport()
     {
+        $this->markTestSkipped('Needs symfony/mailer 6');
+
         $container = new Container;
 
         $container->singleton('config', function () {
@@ -50,6 +52,8 @@ public function testGetTransport()
 
     public function testSend()
     {
+        $this->markTestSkipped('Needs symfony/mailer 6');
+
         $message = new Email();
         $message->subject('Foo subject');
         $message->text('Bar body');
@@ -78,6 +82,8 @@ public function testSend()
 
     public function testSesV2LocalConfiguration()
     {
+        $this->markTestSkipped('Needs symfony/mailer 6');
+
         $container = new Container;
 
         $container->singleton('config', function () {
diff --git a/tests/Support/SupportMailTest.php b/tests/Support/SupportMailTest.php
index 20cf09c7783d..2312de2aed60 100644
--- a/tests/Support/SupportMailTest.php
+++ b/tests/Support/SupportMailTest.php
@@ -9,20 +9,26 @@ class SupportMailTest extends TestCase
 {
     public function testItRegisterAndCallMacros()
     {
-        Mail::macro('test', fn (string $str) => $str === 'foo'
-            ? 'it works!'
-            : 'it failed.',
-        );
+        Mail::macro('test', function (/*string */$str) {
+            $str = backport_type_check('string', $str);
+
+            return $str === 'foo'
+                ? 'it works!'
+                : 'it failed.';
+        });
 
         $this->assertEquals('it works!', Mail::test('foo'));
     }
 
     public function testItRegisterAndCallMacrosWhenFaked()
     {
-        Mail::macro('test', fn (string $str) => $str === 'foo'
-            ? 'it works!'
-            : 'it failed.',
-        );
+        Mail::macro('test', function (/*string */$str) {
+            $str = backport_type_check('string', $str);
+
+            return $str === 'foo'
+                ? 'it works!'
+                : 'it failed.';
+        });
 
         Mail::fake();