How do you enable a postfix operator in scala?

Question

For example, when I try to run:

import scala.concurrent.duration._
Await.result(f, 1 seconds)

I get the error:

postfix operator seconds needs to be enabled

How do I do that?
Why do I need that step when I already included the import?

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See also - Other question for a previous scala version with different error message covering a similar case but with an ! operator for working with files, but this does not ask the general quesion of how to disable postfix operators, or answer the question of how to use scala.concurrent.duration.

Answer 1

Some of Scalas modular language features need enabling.
Enabling can just be done by using the appropriate import.
In this case it's:

import scala.language.postfixOps