<===> input.scss
$name: "lighten";
$args: ("color": #ff0000, "amount": 10%);
foo {
  bar: call($name, $args...);
}

<===> output.css
foo {
  bar: #ff3333;
}

<===> warning
DEPRECATION WARNING: Passing a string to call() is deprecated and will be illegal
in Sass 4.0. Use call(function-reference(lighten)) instead.

<===> warning-dart-sass
DEPRECATION WARNING: Passing a string to call() is deprecated and will be illegal
in Dart Sass 2.0.0. Use call(get-function("lighten")) instead.

  ,
4 |   bar: call($name, $args...);
  |        ^^^^^^^^^^^^^^^^^^^^^
  '
    input.scss 4:8  root stylesheet