diff options
Diffstat (limited to 'test/files/neg/t8104b/Test_2.scala')
-rw-r--r-- | test/files/neg/t8104b/Test_2.scala | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/test/files/neg/t8104b/Test_2.scala b/test/files/neg/t8104b/Test_2.scala new file mode 100644 index 0000000000..a0d35942ba --- /dev/null +++ b/test/files/neg/t8104b/Test_2.scala @@ -0,0 +1,24 @@ +trait Generic[T] { type Repr } +object Generic { + type Aux[T, Repr0] = Generic[T] { type Repr = Repr0 } + import scala.language.experimental.macros + implicit def materializeGeneric[T, Repr]: Generic.Aux[T, Repr] = macro Macros.impl[T] +} + +object Test extends App { + case class C(x: Int, y: Int) + + // this doesn't work because of SI-7470 + // well, in fact SI-7470 has been fixed: https://github.com/scala/scala/pull/2499 + // it's just that the fix hasn't been backported to 2.10.x + // if you've made this compile, consider taking a look at the aforementioned pull request + def reprify[T, Repr](x: T)(implicit generic: Generic.Aux[T, Repr]) = ??? + reprify(C(40, 2)) + + // this is a compilation error at the moment as explained in SI-8104 + // because matchesPt in implicit search says that depoly(<type of materializeGeneric>) isn't a subtype of Generic.Aux[C, (Int, Int)] + // which is rightfully so, because depoly only replaces type parameters, not type members with wildcard types + // however in the future we might want to relax the matchesPt check, so this might start compiling + // therefore, if you've broken this test, then you should be happy, because most likely you've just enabled an interesting use case! + implicitly[Generic.Aux[C, (Int, Int)]] +} |