Use statements must be used

src/Libero/ruleset.xml

@@ -10,6 +10,7 @@
         <exclude name="PSR2.Namespaces.UseDeclaration.SpaceAfterLastUse"/>
     </rule>
 
+    <rule ref="SlevomatCodingStandard.Namespaces.UnusedUses"/>
     <rule ref="SlevomatCodingStandard.Namespaces.UseDoesNotStartWithBackslash"/>
     <rule ref="SlevomatCodingStandard.Namespaces.UseSpacing"/>
     <rule ref="SlevomatCodingStandard.TypeHints.ParameterTypeHintSpacing"/>

tests/cases/php/use-groups

@@ -8,6 +8,10 @@ use Foo\{ Bar, Baz as Qux, Quux\Quuz, const CORGE, function grault };
 use const Foo\{ GARPLY as WALDO, Quux\FRED };
 use function Foo\{ plugh as xyzzy, Quux\thud };
 
+new Bar(grault(CORGE));
+new Qux(xyzzy(WALDO));
+new Quuz(thud(FRED));
+
 ---FIXED---
 <?php
 namespace Vendor;
@@ -22,4 +26,8 @@ use const Foo\Quux\FRED;
 use function Foo\plugh as xyzzy;
 use function Foo\Quux\thud;
 
+new Bar(grault(CORGE));
+new Qux(xyzzy(WALDO));
+new Quuz(thud(FRED));
+
 ---

tests/cases/php/use-unused

@@ -0,0 +1,18 @@
+---DESCRIPTION---
+Use statements must be used
+---CONTENTS---
+<?php
+namespace Vendor;
+
+use Foo;
+use Bar\Baz;
+use const QUX;
+use const Bar\QUUX;
+use function quuz;
+use function Bar\corge;
+
+---FIXED---
+<?php
+namespace Vendor;
+
+---