How to inherit from a composite class in sass?

Question

Sass

header
  & > section:first-child
    display: flex
  
footer
  section
    @extend header > section:first-child //Не работает

https://codepen.io/danilst/pen/xXbPvZ

Answer 1

Selector sequences, such as .foo .baror .foo + .bar, currently can't be extended.

sass-lang.com/documentation/file.SASS_REFERENCE.ht...