Passing an arglist to core-function calls will fail in certain cases

[mirisuzanne]

I get different errors depending on the number of arguments accepted by the internal function - but the issue seems the same. There is no error when directly calling these functions with similar manually-constructed list-arguments, or when calling custom defined functions. The error only occurs when passing an arglist from a custom mixin/function along to an internal function…

Here, I'm calling adjust-color with only one of the many optional arguments:

@function adjust(
  $color,
  $args...
) {
  // not enough arguments for `adjust-color' on line x at column y
  @return call('adjust-color', $color, $args...);

  // this hack seems to fix the problem…
  $hack: join(('adjust-color', $color), $args);
  @return call($hack...);
}

.test {
  color: adjust(#102030, -5);
}

/* expected result */
.test {
  color: #0b2030;
}

When you pass in the exact number of arguments required, the error is slightly different - but the same hack works:

@function dark(
  $color,
  $args...
) {
  // argument `$amount` of `darken($color, $amount)` must be a number
  @return call('darken', $color, $args...);

  // this hack seems to fix the problem…
  $hack: join(('darken', $color), $args);
  @return call($hack...);
}

.test {
  color: dark(#102030, 5%);
}

/* expected result */
.test {
  color: #0a131d;
}

This seems to be true in all versions of Libsass, but not in Ruby Sass. There's a demo on sassmeister, since libsass.ocbnet.ch won't allow me to bookmark this.

I'll add these tests to the spec, and comment with a link…

[mgreter]

@mirisuzanne this seems to error in ruby sass now:

Error: -5 is not a keyword argument for `adjust_color'
        on line 6 of 2472.scss

Can you still somehow reproduce this issue?

[mgreter]

Closing as this seem to be invalid syntax as confirmed with ruby sass and dart sass. Please re-open if you can reproduce the issue. Thanks!

[mirisuzanne]

It seems that one of my examples was bad, but the other still shows the same discrepancy. I removed the error: https://www.sassmeister.com/gist/cd09d650328b8f486a5d3b31c3009225