@mixin flat {
  display: block;
  clear: both;
}

@mixin scoped {
  & {
    font-weight: bold;
  }
}

@mixin mixed {
  display: block;
  clear: both;

  & {
    font-weight: bold;
  }

  .nested {
    font-weight: normal;
  }
}

.a {
  color: red;

  &--bar {
    font-weight: bold;
  }

  .nested {
    font-weight: normal;
  }

  & {
    font-weight: normal;
  }
}

.b {
  color: red;

  & {
    font-size: 20px;
  }

  & {
    font-weight: bold;
  }
}

.c {
  @include flat;
}

.d {
  @include mixed;
}

.e {
  @include scoped
}

.f {
  @include external;
}

.g {
  @include flat;
  font-size: 16px;
}

.h {
  color: red;
  @include flat;
  font-size: 16px;
  @include mixed;
  @include scoped;
}

.i {
  @include flat;
  @include scoped;

  & {
    color: red;
  }
}

.j {
  @include flat;

  & {
    color: red;
  }

  @include scoped;
}

.k {
  @include external;
  font-size: 16px;
}

.l {
  &.not-a-nested-rule {
    font-weight: normal;
  }

  color: red;
}

// This is okay because the mixin isn't known to contain nested rules.
.m {
  @include external-mixin;

  color: red;
}

// This is okay because nothings comes after the mixin.
.n {
  @include external-mixin-known-to-contain-nested-rules;
}

// This is okay because the rule that comes after the mixin is wrapped.
.o {
  @include external-mixin-known-to-contain-nested-rules;

  & {
    color: red;
  }
}