.foo {
  height: 100vh;
  display: block;
  width: 100vw;
  border: 1px;

  .bar {
    width: 50vw;
    content: 'baz';
    border: 1px;
    height: 100vw;
  }
}

.other-property {
  composes: heading;
  height: 100vh;
  display: block;
  width: 100vw;
  border: 1px;
}

.other-property-new {
  height: 100vh;
  display: block;
  width: 100vw;
  border: 1px;
  composes: heading;
}

@function test($foo) {
  // The line below causes the problem
  $bar: $foo;
}

@mixin placeholder {
  $placeholders: ':-webkit-input' ':-moz' '-moz' '-ms-input';
  @each $placeholder in $placeholders {

    &:#{$placeholder}-placeholder {
      @content;
    }
  }
}

@function em($target, $context: $base-font-size) {
  @if not unitless($target) {
    $target: strip-units($target);
  }
  @if not unitless($context) {
    $context: strip-units($context);
  }
  @if $target == 0 { @return 0 }
  @return $target / $context + 0em;
}