<===> input.sass
@mixin foo
  @content;

<===> error
Error: Invalid CSS after "@content": expected newline, was ";"
        on line 1 of input.sass
  Use --trace for backtrace.

<===> error-dart-sass
Error: semicolons aren't allowed in the indented syntax.
  ,
2 |   @content;
  |           ^
  '
  input.sass 2:11  root stylesheet