Shorten multi-return helper namespace

phpunit/src/MultiReturnTest.php

@@ -17,11 +17,11 @@ final class MultiReturnTest extends TestCase
         $code = file_get_contents($cppFile);
 
         $this->assertStringContainsString(
-            'std::tuple<php::Var, php::Var> typephp::detail::multi_return::php_phpunit_multi_values()',
+            'std::tuple<php::Var, php::Var> typephp::detail::php_phpunit_multi_values()',
             $code,
         );
         $this->assertStringContainsString(
-            'std::tie(first, second) = typephp::detail::multi_return::php_phpunit_multi_values()',
+            'std::tie(first, second) = typephp::detail::php_phpunit_multi_values()',
             $code,
         );
         $this->assertStringContainsString(
@@ -33,7 +33,7 @@ final class MultiReturnTest extends TestCase
             $code,
         );
         $this->assertStringNotContainsString(
-            'typephp::detail::multi_return::php_phpunit_multi_side_effect',
+            'typephp::detail::php_phpunit_multi_side_effect',
             $code,
         );
     }

src/CompilerBase.php

@@ -197,7 +197,7 @@ class CompilerBase implements PropertyAccessContext
     public const string NAMESPACE_SEPARATOR = '__';
 
     public const string PREFIX = 'php_';
-    protected const string MULTI_RETURN_NAMESPACE = 'typephp::detail::multi_return';
+    protected const string MULTI_RETURN_NAMESPACE = 'typephp::detail';
     public const string OP_ISSET = 'isset';
     public const string OP_EMPTY = 'empty';
     public const string OP_NOT_EMPTY = 'notEmpty';