Passing ruleset to mixin

[StreetStrider]

Is there any way to pass rulesets to mixins (in common, save rulesets in variables, makin them first-class citizens)?

For instance, I want to customize color of placeholder:

.placeholder (@color) {
  &::-webkit-input-placeholder { color: @color; }
  &:-moz-placeholder { color: @color; }
  &::-moz-placeholder { color: @color; }
  &:-ms-input-placeholder { color: @color; }
}

But what if we need to customize set of properties. It is possible but providing all of them by parameters. In common it would be useful to pass ruleset.

.placeholder (@ruleset) {
  &::-webkit-input-placeholder { /* expand @ruleset it here */ }
}

[SomMeri]

What you ask for is not currently possible. There is an open issue on similar topic #965 , feel free to add your opinions or +1 there.

However, there is a possible workaround: Each less mixin sees its caller scope. E.g. following will work

// This mixins requires ruleset to be defined in callers scope
.placeholder () {
  &::-webkit-input-placeholder { 
    // use ruleset - it is supposed to be defined in caller
    .ruleset(); 
 }
}

// usage example
#use-place{
  // ruleset defined in caller
  .ruleset(){
    color: red;
  }
  // call the mixin
  .placeholder();
}

and produce this:

#use-place::-webkit-input-placeholder {
  color: red;
}

[SomMeri]

I'm closing this as duplicate of #965 . Please, leave comment or re-open if you disagree.

[StreetStrider]

Thanks for help, got food for thought about scopes.