Which directive is used to detect the errors in SASS?

Sass - Interview Questions

Sass @debug directive is used to detect the errors and display the Sass Script expressions values to the standard error output stream.

For example :

$font-sizes: 10px + 20px;    
   $style: (    
     color: #bdc3c7    
   );    
.container{    
    @debug $style;    
    @debug $font-sizes;    
 }