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Json.writes[myScala3Enum] crashes play-json / the compilation? #1019

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nemoo opened this issue Apr 29, 2024 · 1 comment
Open

Json.writes[myScala3Enum] crashes play-json / the compilation? #1019

nemoo opened this issue Apr 29, 2024 · 1 comment

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@nemoo
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nemoo commented Apr 29, 2024

Since somebody else had the same problem, I am now opening this ticket. I guess lots of users who are now starting to use scala 3 will run into this problem.

Expected behaviour
If play-json currently does not support scala 3 enums via Json.writes, it should tell the user that in a compiler message.

Actual behaviour
If Json.writes[T] is used on a scala 3 enum, compiling it with scala-cli or sbt crashes the compilation process. Compilation can only be killed via the task manager.

How to reproduce (tested on Java 11):

//> using scala 3.3.3
//> using dep org.playframework::play-json:3.0.2
import play.api.libs.json.*

enum Color:
  case red,green,blue

@main
def main =
  implicit val myWrites: OWrites[Color] = Json.writes[Color] //this line produces the crash
@nemoo nemoo changed the title Json.writes[myScala3Enum] crashes play-json / the compiler? Json.writes[myScala3Enum] crashes play-json / the compilation? Apr 29, 2024
@cchantep
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Duplicate of #1017

@cchantep cchantep marked this as a duplicate of #1017 Jul 20, 2024
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