Extractor extension methods

[nicolasstucki]

minimized code

type X
val x: X = ???
extension (x: X) def unapply(arg: Any): Boolean = true
def test =
  ??? match
    case x() =>

Compilation output

-- [E127] Syntax Error: tests/run-macros/i8530-b/Macros_1.scala:7:9 ------------
7 |    case x() =>
  |         ^
  |x cannot be used as an extractor in a pattern because it lacks an unapply or unapplySeq method

expectation

Extension methods should be taken into account for extractors. The code above should compile.

[odersky]

Should this go to the feature request repo?

[nicolasstucki]

Should this go to the feature request repo?

Not sure, it is part of supporting code that was supported in Scala 2

[nicolasstucki]

This feature is already supported. Adding a regression test and closing this issue in scala/scala3#14447.