What are you expecting in terms of debugging? are you looking to use Sass’ @debug?
It’s a little silly, but I’ve done this before to see the output of a Sass variable:
body {
&:after {
content: "#{$primary}" !important;
display: block;
background: salmon;
color: white;
position: fixed;
left: 0;
top: 0;
z-index: 99999999;
}
}