A joint use of both features

[rchavez2]

"A joint use of both features facilitates the definition of new statements without using meta-programming facilities such as macros."

Which two features?

They are actually mentioned in other languages but are missing here in the English version.

[heathermiller]

It would be most helpful if you could tell us which document this quote comes from.

[rchavez2]

It's in Introduction (tour-of-scala.html) > Scala is extensible.

[SethTisue]

#896