Generated by SassMeister.com.

SassMeister-input.scss

// ----
// libsass (v3.1.0)
// ----

@function strip-unit($num) {
    @if type-of($num) == "number" {
        @return $num / ($num * 0 + 1);
    } @else {
        @warn "Not a number value: #{num}";
        @return $num;
    }
}

@mixin rem($property, $values...) {
    $max: length($values);
    $suffix: "";
    $px-values: "";
    $rem-values: "";

    @for $i from 1 through $max {
        @if type-of(nth($values, $i)) == "number" {
            $value: strip-unit(nth($values, $i));
            $px-values: #{$px-values + $value*16}px;
        } @else {
            $px-values: #{$px-values + nth($values, $i)};
        }

        @if $i < $max {
            $px-values: #{$px-values + " "};
        }
    }

    @for $i from 1 through $max {
        @if type-of(nth($values, $i)) == "number" {
            $value: strip-unit(nth($values, $i));
            $rem-values: #{$rem-values + $value}rem;
        } @else {
            $rem-values: #{$rem-values + nth($values, $i)};
        }

        @if $i < $max {
            $rem-values: #{$rem-values + ' '};
        }
    }

    #{$property}: $px-values + $suffix;
    #{$property}: $rem-values + $suffix;
}

.foo {
  @include rem('margin', 5, 2, any-suffix, !important, another-suffix);
}

SassMeister-output.css

.foo {
  margin: 80px 32px any-suffix !important another-suffix;
  margin: 5rem 2rem any-suffix !important another-suffix; }