When should I (and should I not) use Scala's @inline annotation?

Question

I believe I understand the basics of inline functions: instead of a function call resulting in parameters being placed on the stack and an invoke operation occurring, the de

Answer 1

Personally, I use @inline for alias:

class A(param: Param){
  @inline def a = param.a
  def a2() = a * a
}

Now, I couldn't find a way to know if it does anything (I tried to jad the generated .class, but couldn't conclude anything).

My goal is to explicit what I want the compiler to do. But let it decide what's best, or simply do what it's capable of. If it doesn't do it, maybe later compiler version will.