Is there an equivalent to SuppressWarnings in Scala?

Scala 2.13.2 provides @nowarn annotation developed on the basis of ghik's silencer, for example

import scala.annotation.nowarn
def t = { 0: @nowarn; 1 }

raises no warnings, whilst

def t = { 0; 1 }

gives

warning: a pure expression does nothing in statement position; multiline expressions might require enclosing parentheses
  def t = { 0; 1 }
            ^

EDIT: You should use @nowarn

---

There is a simple compiler plugin for this: silencer (a bit shameless plug)

No, and an enhancement request [1] for such a feature was closed as wontfix.

I agree it would be useful. I expect that the Scala core team aren't against the idea, but they have finite resources and many higher priorities.

update: this feature was eventually implemented in scala 2.13.2 release on 2020-04-22, see this answer

[1] https://issues.scala-lang.org/browse/SI-1781