[CLEANUP] Rector: Add missing return type declaration based on parent class method

src/CSSList/AtRuleBlockList.php

@@ -48,10 +48,7 @@ public function atRuleArgs()
         return $this->sArgs;
     }
 
-    /**
-     * @return string
-     */
-    public function __toString()
+    public function __toString(): string
     {
         return $this->render(new OutputFormat());
     }

src/CSSList/CSSList.php

@@ -394,10 +394,7 @@ public function removeDeclarationBlockBySelector($mSelector, $bRemoveAll = false
         }
     }
 
-    /**
-     * @return string
-     */
-    public function __toString()
+    public function __toString(): string
     {
         return $this->render(new OutputFormat());
     }

src/CSSList/KeyFrame.php

@@ -59,10 +59,7 @@ public function getAnimationName()
         return $this->animationName;
     }
 
-    /**
-     * @return string
-     */
-    public function __toString()
+    public function __toString(): string
     {
         return $this->render(new OutputFormat());
     }

src/Comment/Comment.php

@@ -51,10 +51,7 @@ public function setComment($sComment): void
         $this->sComment = $sComment;
     }
 
-    /**
-     * @return string
-     */
-    public function __toString()
+    public function __toString(): string
     {
         return $this->render(new OutputFormat());
     }

src/Property/CSSNamespace.php

@@ -51,10 +51,7 @@ public function getLineNo()
         return $this->iLineNo;
     }
 
-    /**
-     * @return string
-     */
-    public function __toString()
+    public function __toString(): string
     {
         return $this->render(new OutputFormat());
     }

src/Property/Charset.php

@@ -69,10 +69,7 @@ public function getCharset()
         return $this->oCharset->getString();
     }
 
-    /**
-     * @return string
-     */
-    public function __toString()
+    public function __toString(): string
     {
         return $this->render(new OutputFormat());
     }

src/Property/Import.php

@@ -68,10 +68,7 @@ public function getLocation()
         return $this->oLocation;
     }
 
-    /**
-     * @return string
-     */
-    public function __toString()
+    public function __toString(): string
     {
         return $this->render(new OutputFormat());
     }

src/Property/Selector.php

@@ -113,10 +113,7 @@ public function setSelector($sSelector): void
         $this->iSpecificity = null;
     }
 
-    /**
-     * @return string
-     */
-    public function __toString()
+    public function __toString(): string
     {
         return $this->getSelector();
     }

src/Rule/Rule.php

@@ -247,10 +247,7 @@ public function getIsImportant()
         return $this->bIsImportant;
     }
 
-    /**
-     * @return string
-     */
-    public function __toString()
+    public function __toString(): string
     {
         return $this->render(new OutputFormat());
     }

src/RuleSet/AtRuleSet.php

@@ -51,10 +51,7 @@ public function atRuleArgs()
         return $this->sArgs;
     }
 
-    /**
-     * @return string
-     */
-    public function __toString()
+    public function __toString(): string
     {
         return $this->render(new OutputFormat());
     }

src/RuleSet/DeclarationBlock.php

@@ -775,11 +775,9 @@ public function createFontShorthand(): void
     }
 
     /**
-     * @return string
-     *
      * @throws OutputException
      */
-    public function __toString()
+    public function __toString(): string
     {
         return $this->render(new OutputFormat());
     }

src/RuleSet/RuleSet.php

@@ -252,10 +252,7 @@ public function removeRule($mRule): void
         }
     }
 
-    /**
-     * @return string
-     */
-    public function __toString()
+    public function __toString(): string
     {
         return $this->render(new OutputFormat());
     }

src/Value/CSSFunction.php

@@ -96,10 +96,7 @@ public function getArguments()
         return $this->aComponents;
     }
 
-    /**
-     * @return string
-     */
-    public function __toString()
+    public function __toString(): string
     {
         return $this->render(new OutputFormat());
     }

src/Value/CSSString.php

@@ -86,10 +86,7 @@ public function getString()
         return $this->sString;
     }
 
-    /**
-     * @return string
-     */
-    public function __toString()
+    public function __toString(): string
     {
         return $this->render(new OutputFormat());
     }

src/Value/Color.php

@@ -144,10 +144,7 @@ public function getColorDescription()
         return $this->getName();
     }
 
-    /**
-     * @return string
-     */
-    public function __toString()
+    public function __toString(): string
     {
         return $this->render(new OutputFormat());
     }

src/Value/LineName.php

@@ -45,10 +45,7 @@ public static function parse(ParserState $oParserState): LineName
         return new LineName($aNames, $oParserState->currentLine());
     }
 
-    /**
-     * @return string
-     */
-    public function __toString()
+    public function __toString(): string
     {
         return $this->render(new OutputFormat());
     }

src/Value/Size.php

@@ -194,10 +194,7 @@ public function isRelative(): bool
         return false;
     }
 
-    /**
-     * @return string
-     */
-    public function __toString()
+    public function __toString(): string
     {
         return $this->render(new OutputFormat());
     }

src/Value/URL.php

@@ -72,10 +72,7 @@ public function getURL()
         return $this->oURL;
     }
 
-    /**
-     * @return string
-     */
-    public function __toString()
+    public function __toString(): string
     {
         return $this->render(new OutputFormat());
     }

src/Value/ValueList.php

@@ -77,10 +77,7 @@ public function setListSeparator($sSeparator): void
         $this->sSeparator = $sSeparator;
     }
 
-    /**
-     * @return string
-     */
-    public function __toString()
+    public function __toString(): string
     {
         return $this->render(new OutputFormat());
     }