CSS → Селектор в качестве параметра миксина LESS

.my-mixin (@selector) {
  background: white;
  @{selector} {
    background: red;
  }
}
 
.parent {
  .my-mixin(~'.child');
}

.my-mixin (@selector) {
  background: white;
  @selector-escaped: ~'@{selector}';
  @{selector-escaped} {
    background: red;
  }
}
 
.parent {
  .my-mixin('.child');
}

.parent {
  background: white;
}
.parent .child {
  background: red;
}