Inline comments in Sass functions

[sandrojohanides]

Seems only broken if in Sass native functions.

@function tone-color($color, $tone: primary, $tone-factor: 10%) {
    @return if(
        $tone == primary, // Do not tone primary color
        $color,
        mix($color, color($tone, unthemed), if(
            $tone == inverted, // Tone inverted color with different factor
            75%,
            $tone-factor
        ))
    );
}