multiple `@nowarn` annotation does not work since Scala 3.7.0

[xuwei-k]

Compiler version

• 3.7.0
• 3.7.1
• 3.7.2
• 3.8.0-RC1-bin-20250731-fe6b7eb-NIGHTLY

Minimized code

//> using scala 3.7.2
//> using options -deprecation

package example

import scala.annotation.nowarn

@deprecated
class A

@deprecated
class B

@nowarn("msg=class A in package example is deprecated")
@nowarn("msg=class B in package example is deprecated")
trait C1 {
  def a: A
  def b: B
}

@nowarn("msg=class B in package example is deprecated")
@nowarn("msg=class A in package example is deprecated")
trait C2 {
  def a: A
  def b: B
}

Output

[warn] ./A.scala:18:10
[warn] class B in package example is deprecated
[warn]   def b: B
[warn]          ^
[warn] ./A.scala:24:10
[warn] class A in package example is deprecated
[warn]   def a: A
[warn]          ^

Expectation

suppress all warnings. but compiler report warnings. secondary @nowarn annotation does not work.

note

suppress all warnings with Scala 3.3.6, 3.4.3, 3.5.2, 3.6.4

[som-snytt]

No warning in Scala 2. Edit: no idea what the dude tried, but it warns the same in Scala 2.

I labeled it better-errors because it is in that area of messaging improvements.

[som-snytt]

The message to match is incorrect:

@nowarn("cat=deprecation&msg=class A is deprecated")
@nowarn("cat=deprecation&msg=class B is deprecated")

I added the category "for good measure".

[som-snytt]

oh, [warn] is sbt output. I wonder if sbt reports deprecations differently.

[xuwei-k]

Welcome to Scala 3.7.2 (21.0.7, Java OpenJDK 64-Bit Server VM).
Type in expressions for evaluation. Or try :help.
                                                                                                                                            
scala> import scala.annotation.nowarn
     | 
     | @deprecated
     | class A
     | 
     | @deprecated
     | class B
// defined class A
// defined class B
                                                                                                                                            
scala> @nowarn("cat=deprecation&msg=class A is deprecated")
     | @nowarn("cat=deprecation&msg=class B is deprecated")
     | trait C1 {
     |   def a: A
     |   def b: B
     | }
1 warning found
// defined trait C1
-- Deprecation Warning: --------------------------------------------------------
5 |  def b: B
  |         ^
  |         class B is deprecated

🤔

[xuwei-k]

bisect with maven central NIGHTLY versions.

• OK 3.7.0-RC1-bin-20250119-bd699fc-NIGHTLY
• NG 3.7.0-RC1-bin-20250120-db23c08-NIGHTLY

bd699fc...db23c08

maybe

• Suppress spurious Suppression #22383 🤔

[som-snytt]

Sorry, I actually had a local fix but was distracted by the message mismatch!