nowarn

An annotation for local warning suppression.

The optional value parameter allows selectively silencing messages. See -Wconf:help for help writing a message filter expression, or use @nowarn("verbose") / @nowarn("v") to display message filters applicable to a specific warning.

Examples:

 def f = {
   1: @nowarn // don't warn "a pure expression does nothing in statement position"
   2
 }

 // show the warning, plus the applicable @nowarn / Wconf filters ("cat=other-pure-statement", ...)
 @nowarn("v") def f = { 1; 2 }

 @nowarn def f = { 1; deprecated() } // don't warn

 @nowarn("msg=pure expression does nothing")
 def f = { 1; deprecated() } // show deprecation warning

To ensure that a @nowarn annotation actually suppresses a warning, enable -Xlint:unused or -Wunused:nowarn. The unused annotation warning is emitted in category unused-nowarn and can be selectively managed using -Wconf:cat=unused-nowarn:s.