diff --git a/src/ControlStructure/BlockToken.php b/src/ControlStructure/BlockToken.php
index 258f846..8b728b5 100644
--- a/src/ControlStructure/BlockToken.php
+++ b/src/ControlStructure/BlockToken.php
@@ -8,17 +8,22 @@ class BlockToken implements ControlStructure {
 
     public function parse(\Picea\Compiler\Context &$context, ?string $arguments, string $token, array $options = []) : string
     {
+        static $depth = 0;
         static $slotDefinitions = [];
 
+        # dump($depth, $token, $arguments, $slotDefinitions);
+
         switch($token) {
             case "block":
                 $slotDefinitions[] = $this->slotDefinitions();
-                
+                $depth++;
+
                 return "<?php \$___block = \Picea\ControlStructure\BlockToken::instanciateBlock($arguments); ?>";
-            
+
             case "endblock":
+                $depth--;
                 return "<?php echo \$___block->render(\$___class__template); unset(\$___block); ?>";
-            
+
             case "arguments":
                 $class = static::class;
 
@@ -36,19 +41,19 @@ class BlockToken implements ControlStructure {
                         }
                     /*%EXCEPTION_LINE_BASE%*/?>
                 PHP;
-            
+
             case "define":
                 list($name, $definition) = array_pad(explode(',', $arguments, 2), 2, "");
-                
-                end($slotDefinitions)->setDefinition(eval("return $name;"), $definition);
-                
+
+                ( $slotDefinitions[$depth] ?? end($slotDefinitions) )->setDefinition(eval("return $name;"), $definition);
+
                 return <<<PHP
                 <?php \$this->defineSlot($name, function($definition) {}); ?>
                 PHP;
-                    
+
             case "slot":
-                $def = end($slotDefinitions);
-                
+                $def = ( $slotDefinitions[$depth] ?? end($slotDefinitions) );
+
                 list($name, $definition) = array_pad(explode(',', $arguments, 2), 2, "");
 
                 $loops = count($context->iterationStack ?? []) ? ",". implode(', ', array_filter(array_column($context->iterationStack, 'uid'), fn($e) => strpos($e, '[') === false)) : null;
@@ -57,7 +62,7 @@ class BlockToken implements ControlStructure {
                     $slotName = eval("return $name;");
                     $def->currentSlot = $slotName;
                     $def->setDefinitionVars($slotName, $definition);
-                    
+
                     $definition = $def->printDefinition($slotName);
 
                     if ($definition) {
@@ -72,18 +77,18 @@ class BlockToken implements ControlStructure {
                     if ($definition) {
                         $definition .= ",";
                     }
-                    
+
                     return <<<PHP
-                    <?php (\$___block ?? \$this)->slotIsSet($name) || \$___block->setSlot($name, function($definition array \$___using = []) use (\$picea $loops) { extract(\$___using, \EXTR_SKIP); ?>
+                    <?php (\$___block ?? \$this)->slotIsSet($name) || (\$___block ?? \$this)->setSlot($name, function($definition array \$___using = []) use (\$picea $loops) { extract(\$___using, \EXTR_SKIP); ?>
                     PHP;
                 }
-                    
+
             case "endslot":
-                $def =end($slotDefinitions);
-                
+                $def = ( $slotDefinitions[$depth] ?? end($slotDefinitions) );
+
                 if ($def->hasDefinitions() ) {
                     $definition = $def->getCurrentSlotDefinitionVars();
-                    
+
                     if ($definition) {
                         $definition .= ",";
                     }
@@ -95,23 +100,23 @@ class BlockToken implements ControlStructure {
                 else {
                     return "<?php }); ?>";
                 }
-                
+
             case "using":
                 return "<?php \$___block->setUsing($arguments); ?>";
         }
     }
-    
-    
+
+
     public function inlineHtml(? object $proxy, string $viewPath, ... $variables) {
         return $this->renderHtml($viewPath, [ 'inlineVariables' => $variables ], $proxy);
     }
-    
+
     public static function parseSlotArguments(Callable $method) : array
     {
-        #return 
+        #return
     }
-        
-        
+
+
     public static function parseArguments(Callable $method, array $arguments) : array
     {
         try{
@@ -119,10 +124,10 @@ class BlockToken implements ControlStructure {
         }
         catch(\TypeError $ex) {
             throw $ex;
-        } 
-        
+        }
+
         $parameters = [];
-        
+
         foreach((new \ReflectionFunction($method))->getParameters() as $key => $value) {
             if ( isset($arguments[$key]) ) {
                 $parameters[ $value->getName() ] = $arguments[$key];
@@ -137,114 +142,114 @@ class BlockToken implements ControlStructure {
                 $parameters[ $value->getName() ] = null;
             }
         }
-        
+
         return $parameters;
     }
-    
+
     public static function slotDefinitions() {
         return new class() {
-            
+
             public array $definitions = [];
-            
+
             public array $variables = [];
-            
+
             public bool $rendering = false;
-            
+
             public string $currentSlot;
-            
-            public function setDefinition(string $name, string $definition) : self 
+
+            public function setDefinition(string $name, string $definition) : self
             {
                 $this->definitions[$name] = $definition;
-                
+
                 return $this;
             }
-            
+
             public function setDefinitionVars(string $name, string $variables) : self
             {
                 $this->variables[$name] = $variables;
-                
+
                 return $this;
             }
-            
+
             public function getDefinitionVars(string $name) : string
             {
                 return $this->variables[$name] ?? "";
             }
-            
+
             public function getCurrentSlotDefinitionVars() : string
             {
                 return $this->getDefinitionVars($this->currentSlot);
             }
-            
+
             public function hasDefinitions() : bool
             {
                 return count($this->definitions) > 0;
             }
-            
+
             public function printDefinition(string $name) : string
             {
                 if ( ! isset($this->definitions[$name]) ) {
                     throw new \Exception("Slot definition for `$name` was not found. Have you defined it in your block header using something like '{% define \"$name\", ...\$arguments %}' ?");
                 }
-                
+
                 return $this->definitions[$name];
             }
-            
+
             public function render() : void
             {
                 $this->rendering = true;
             }
         };
     }
-    
-    public static function instanciateBlock(string $viewPath, ... $arguments) 
+
+    public static function instanciateBlock(string $viewPath, ... $arguments)
     {
         return new class($viewPath, ...$arguments) {
-            
+
             public bool $rendering = false;
-            
+
             public string $viewPath;
-            
+
             public array $using = [];
-            
+
             public array $arguments = [];
-            
+
             public array $slots = [];
-            
+
             public array $definition = [];
-            
+
             public function __construct(string $viewPath, ...$arguments) {
                 $this->viewPath = $viewPath;
                 $this->arguments = $arguments;
             }
-            
+
             public function render(object $classTemplate) : string
             {
                 $this->rendering = true;
 
                 return $classTemplate->picea->inlineBlock($this, $this->viewPath, ...$this->arguments);
             }
-            
+
             public function setSlot(string $name, Callable $method) : void
             {
                 $this->slots[$name] = $method;
             }
-            
+
             public function defineSlot(string $name, Callable $method) : void
             {
                 $this->definition[$name] = $method;
             }
-            
+
             public function slotIsSet(string $name) : bool
             {
                 return ! empty($this->slots[$name]);
             }
-            
+
             public function printSlot(string $name, Callable $default)
             {
                 return $this->slotIsSet($name) ? $this->slots[$name] : $default;
             }
-            
+
             public function setUsing(array $variables) {
                 $this->using = $variables;
             }