sass-lint: Reporting color functions as invalid uses of color literals

Using gulp-sass-lint v1.2.0

---

I have this code

$color-rgba: rgba(red($input-border-focus), green($input-border-focus), blue($input-border-focus), .6);
box-shadow: $form-shadows, 0 0 8px $color-rgba;

Which produces these errors, which seems incorrect since the color names above are the built-in SCSS functions, not color literals.

  27:22  warning  Color functions such as 'red' should not be passed to functions, use variables    no-color-literals
  27:48  warning  Color functions such as 'green' should not be passed to functions, use variables  no-color-literals
  27:76  warning  Color functions such as 'blue' should not be passed to functions, use variables   no-color-literals

---

When re-written as a single line like this

box-shadow: $form-shadows, 0 0 8px rgba(red($input-border-focus), green($input-border-focus), blue($input-border-focus), .6);;

I only get this one error instead

  27:39  warning  Color functions such as 'rgba' should only be used in variable declarations  no-color-literals

---

Unless I’m missing something this seems like a bug to me, and I don’t see a way around this except to either disable this rule (which seems like a bad solution) or to just exclude this one file from linting right now.

I was able to re-write this code into 4 variables, which is a little bit of an insane work around… but at least it accepts the code now

//Due to a bug in `sass-lint` this must be broken up into multiple variables.
//Otherwise it sees the color function as color literals and reports them as violations :/
$color-r: red($input-border-focus);
$color-g: green($input-border-focus);
$color-b: blue($input-border-focus);
$color-rgba: rgba($color-r, $color-g, $color-b, .6);
box-shadow: $form-shadows, 0 0 8px $color-rgba;