SCSS compilation error

[UliZappe]

In the latest published version (2.3.84) at least, SCSS compilation breaks at the following code:

:root
{
    --activeColor: #{$activeColor};
}

This is perfectly legal code, but the compiler throws the following error and stops compilation:

Syntax error: Invalid CSS after "    -": expected number or function, was "-activeColor..."
        on line 3 of ~/Sites/Test/test.scss
  Use --trace for backtrace.