1<===> input.scss
2foo {
3  foo: foo(());
4}
5
6<===> error
7Error: () isn't a valid CSS value.
8        on line 2 of input.scss
9  Use --trace for backtrace.
10
11<===> error-dart-sass
12Error: () isn't a valid CSS value.
13  ,
142 |   foo: foo(());
15  |            ^^
16  '
17  input.scss 2:12  root stylesheet
18