Sass variable name

gistfile1.scss

 
@mixin hoge-fuga {
  content: 'a';
}

@mixin hoge_fuga {
  content: 'b';
}

.hoge {
  @include hoge-fuga;  // b
}

%hoge-fuga {
  content: 'c';
}

%hoge_fuga {
  content: 'd';
}

.fuga {
  @extend %hoge-fuga; // c
}