What does the arrow in an import statement do?

Question

I've found the the following import in some scala:

import Predef.{println => _, _}

What does the => do?

Answer 1

Generally => in an import allows you to alias an existing name into an alternate name:

import scala.{Int => i32}

This would allow you to use i32 in place of Int

Further, importing _ imports all symbols into the current namespaces.

Now, aliasing a name into _, however does the opposite, i.e. excludes it from the import:

import Predef.{println => _, _}

means

*Import all from Predef except println