names of anonymous functions generated as annotation arguments are not unique

[bertlebee]

Compiler version

3.1.1

Minimized code

https://scastie.scala-lang.org/JyCTJBMCRIKW73xNmAuaLA

import scala.annotation.Annotation

class AnAnnotation(function: Int => String) extends Annotation

@AnAnnotation(_.toString)
val a = 1
@AnAnnotation(_.toString.length.toString)
val b = 2

Output

Double definition:
def $anonfun(_$2: Int): String in object Playground at line 9 and
def $anonfun(_$1: Int): String in object Playground at line 7

Expectation

generated anonymous functions should have unique names

[bertlebee]

similar issue for annotations on function arguments
https://scastie.scala-lang.org/9pEHR8DqSr6MbGci5ONv0w
and
https://scastie.scala-lang.org/gFlKy6QATEqpQcNyvs7R4w

[odersky]

Thanks for the report, and sorry it took so long to fix.

[bertlebee]

Thanks for the fix :)