The implicit references coming from the context.
The level increases if current context has a different owner or scope than the context of the next-outer ImplicitRefs. This is however disabled under Scala2 mode, since we do not want to change the implicit disambiguation then.
The implicit references
The implicit references that are eligible for type
This context, or a copy, ensuring root import from symbol
is not present in outer implicits.
Is this the outermost implicits? This is the case if it either the implicits of NoContext, or the last one before it.