Generic signature of lambda missing method parameters

[smarter]

I haven't managed to minimize it, but if you compile scalacheck with sbt jvm/compile and then do javap -p -v jvm/target/scala-0.5/classes/org/scalacheck/ArbitraryArities.class there's something fishy:

private static org.scalacheck.Gen<scala.Function1<T1, Z>> arbFunction1$$anonfun$1();
  descriptor: (Lorg/scalacheck/Arbitrary;Lorg/scalacheck/Cogen;)Lorg/scalacheck/Gen;
  // body skipped ...
  Signature: #1286                        // ()Lorg/scalacheck/Gen<Lscala/Function1<TT1;TZ;>;>;

The generic signature is missing the method parameters that can be seen in the descriptor. I noticed this because it crashes the cfr decompiler.

[smarter]

This bug is not detected by -Xverify-signature.

[Duhemm]

Thanks for the report @smarter, I'm on it. In the meantime and in case that's blocking you, you can use -Yno-generic-signatures to disable generic signatures altogether.