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I was just troubleshooting this and your post was basically the only one I found. I was using a @mixin that scales font sizes for screen sizes and kept getting an error in my @mixin when the input variable for the list in @each loop didnt have a comma in it.

Doensn't work:

$text_sizes: 'html' 17px;

Works:

$text_sizes: 'html' 17px,;

Mixin:

@adjust_screens: 1280px 0.9, ...;

@mixin fontsizer ( $tag_and_base,$screens ) {
    @each $tag, $base in $tag_and_base {
        // got an error here: "expected selector."
        #{$tag} {
            font-size: calc( #{$base_size} *  1 );
        }
        @each $x, $y in $screens {
         ...repeats font size calculation for sizes
        }
    }
}

@include fontsizer( $text_sizes, $adjust_screens );

Not sure if this is how it's supposed to work or if this will work in every compiler, but it does work in sass-lang.com playground (https://sass-lang.com/playground/)

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