diff --git a/Caster/ClassStub.php b/Caster/ClassStub.php
index fb8377a0..f27a17ce 100644
--- a/Caster/ClassStub.php
+++ b/Caster/ClassStub.php
@@ -56,9 +56,7 @@ public function __construct(string $identifier, callable|array|string $callable
             }
 
             if (str_contains($identifier, "@anonymous\0")) {
-                $this->value = $identifier = preg_replace_callback('/[a-zA-Z_\x7f-\xff][\\\\a-zA-Z0-9_\x7f-\xff]*+@anonymous\x00.*?\.php(?:0x?|:[0-9]++\$)[0-9a-fA-F]++/', function ($m) {
-                    return class_exists($m[0], false) ? (get_parent_class($m[0]) ?: key(class_implements($m[0])) ?: 'class').'@anonymous' : $m[0];
-                }, $identifier);
+                $this->value = $identifier = preg_replace_callback('/[a-zA-Z_\x7f-\xff][\\\\a-zA-Z0-9_\x7f-\xff]*+@anonymous\x00.*?\.php(?:0x?|:[0-9]++\$)[0-9a-fA-F]++/', fn ($m) => class_exists($m[0], false) ? (get_parent_class($m[0]) ?: key(class_implements($m[0])) ?: 'class').'@anonymous' : $m[0], $identifier);
             }
 
             if (null !== $callable && $r instanceof \ReflectionFunctionAbstract) {
diff --git a/Caster/ExceptionCaster.php b/Caster/ExceptionCaster.php
index 14caf71f..80a91ead 100644
--- a/Caster/ExceptionCaster.php
+++ b/Caster/ExceptionCaster.php
@@ -288,9 +288,7 @@ private static function filterExceptionArray(string $xClass, array $a, string $x
         unset($a[$xPrefix.'string'], $a[Caster::PREFIX_DYNAMIC.'xdebug_message'], $a[Caster::PREFIX_DYNAMIC.'__destructorException']);
 
         if (isset($a[Caster::PREFIX_PROTECTED.'message']) && str_contains($a[Caster::PREFIX_PROTECTED.'message'], "@anonymous\0")) {
-            $a[Caster::PREFIX_PROTECTED.'message'] = preg_replace_callback('/[a-zA-Z_\x7f-\xff][\\\\a-zA-Z0-9_\x7f-\xff]*+@anonymous\x00.*?\.php(?:0x?|:[0-9]++\$)[0-9a-fA-F]++/', function ($m) {
-                return class_exists($m[0], false) ? (get_parent_class($m[0]) ?: key(class_implements($m[0])) ?: 'class').'@anonymous' : $m[0];
-            }, $a[Caster::PREFIX_PROTECTED.'message']);
+            $a[Caster::PREFIX_PROTECTED.'message'] = preg_replace_callback('/[a-zA-Z_\x7f-\xff][\\\\a-zA-Z0-9_\x7f-\xff]*+@anonymous\x00.*?\.php(?:0x?|:[0-9]++\$)[0-9a-fA-F]++/', fn ($m) => class_exists($m[0], false) ? (get_parent_class($m[0]) ?: key(class_implements($m[0])) ?: 'class').'@anonymous' : $m[0], $a[Caster::PREFIX_PROTECTED.'message']);
         }
 
         if (isset($a[Caster::PREFIX_PROTECTED.'file'], $a[Caster::PREFIX_PROTECTED.'line'])) {
diff --git a/Tests/Cloner/VarClonerTest.php b/Tests/Cloner/VarClonerTest.php
index 36639ca9..ad179699 100644
--- a/Tests/Cloner/VarClonerTest.php
+++ b/Tests/Cloner/VarClonerTest.php
@@ -399,9 +399,7 @@ public function testJsonCast()
     public function testCaster()
     {
         $cloner = new VarCloner([
-            '*' => function ($obj, $array) {
-                return ['foo' => 123];
-            },
+            '*' => fn ($obj, $array) => ['foo' => 123],
             __CLASS__ => function ($obj, $array) {
                 ++$array['foo'];
 
diff --git a/Tests/Command/Descriptor/CliDescriptorTest.php b/Tests/Command/Descriptor/CliDescriptorTest.php
index 56fb2187..6b1f5430 100644
--- a/Tests/Command/Descriptor/CliDescriptorTest.php
+++ b/Tests/Command/Descriptor/CliDescriptorTest.php
@@ -45,9 +45,7 @@ public function testDescribe(array $context, string $expectedOutput, bool $decor
     {
         $output = new BufferedOutput();
         $output->setDecorated($decorated);
-        $descriptor = new CliDescriptor(new CliDumper(function ($s) {
-            return $s;
-        }));
+        $descriptor = new CliDescriptor(new CliDumper(fn ($s) => $s));
 
         $descriptor->describe($output, new Data([[123]]), $context + ['timestamp' => 1544804268.3668], 1);