SassScript not supported in the url() of an @import rule

[andrew-skybound]

Only happens in @import rules. (Perhaps this is related to #1595?)

Input SCSS:

@import url(unquote("fi" + "le.css"));

Ruby SASS (3.4.19)

@import url(file.css);

Libsass (3.3.2)

Error: URI is missing ')'
        on line 1 of test.scss
>> @import url(unquote("fi" + "le.css"));

[xzyfer]

This is a duplicate of #1597

[xzyfer]

Closing in favour of #1597