Should throw an error when passing a block into a mixin without @content

[xzyfer]

@mixin foo() {
    foo: &;
}

foo {
  @include foo { bar: baz }
}

Ruby Sass

Error: Mixin "foo" does not accept a content block.
        on line 34 of test.scss, in `foo'
        from line 34 of test.scss

LibSass

foo {
  foo: foo; }

[xzyfer]

Spec added sass/sass-spec#483