<===> input.scss
$empty-list: ();

@function foo($args...) {
    @return call(bar, $args...);
}

@function bar($list) {
    @return length($list);
}

test {
  test: foo($empty-list);
}
<===> output.css
test {
  test: 0;
}

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

  ,
4 |     @return call(bar, $args...);
  |             ^^^^^^^^^^^^^^^^^^^
  '
    input.scss 4:13  foo()
    input.scss 12:9  root stylesheet