fix: undefined variables

Signed-off-by: Bart Jaskulski <bjaskulski@protonmail.com>

src/Binding/Binder/CallableBinder.php

@@ -24,10 +24,10 @@ class CallableBinder implements Binder {
 
 	public function bind( Definition $def ): void {
 		if ( $def instanceof CallableDefinition ) {
-			$ref        = new \ReflectionFunction( $definition->value() );
+			$ref        = new \ReflectionFunction( $def->value() );
 			$parameters = [];
 			foreach ( $ref->getParameters() as $ref_param ) {
-				$parameters[] = $container->get( $ref_param->getType()->getName() );
+				$parameters[] = $this->container->get( $ref_param->getType()->getName() );
 			}
 			$ref->invokeArgs( $parameters );
 		}