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author | Samuel Gruetter <samuel.gruetter@epfl.ch> | 2014-03-12 22:44:33 +0100 |
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committer | Samuel Gruetter <samuel.gruetter@epfl.ch> | 2014-03-12 22:44:33 +0100 |
commit | 9ef5f6817688f814a3450126aa7383b0928e80a0 (patch) | |
tree | 5727a2f7f7fd665cefdb312af2785c692f04377c /tests/untried/pos/typesafecons.scala | |
parent | 194be919664447631ba55446eb4874979c908d27 (diff) | |
download | dotty-9ef5f6817688f814a3450126aa7383b0928e80a0.tar.gz dotty-9ef5f6817688f814a3450126aa7383b0928e80a0.tar.bz2 dotty-9ef5f6817688f814a3450126aa7383b0928e80a0.zip |
add tests from scala/test/files/{pos,neg}
with explicit Unit return type
Diffstat (limited to 'tests/untried/pos/typesafecons.scala')
-rw-r--r-- | tests/untried/pos/typesafecons.scala | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/tests/untried/pos/typesafecons.scala b/tests/untried/pos/typesafecons.scala new file mode 100644 index 000000000..524328016 --- /dev/null +++ b/tests/untried/pos/typesafecons.scala @@ -0,0 +1,30 @@ +object Pair { + sealed trait Pair { + type First + type Second <: Pair + } + + class End extends Pair { + type First = Nothing + type Second = End + + def ::[T](v : T) : Cons[T, End] = Cons(v, this) + } + + case object End extends End + + final case class Cons[T1, T2 <: Pair](_1 : T1, _2 : T2) extends Pair { + type First = T1 + type Second = T2 + + def ::[T](v : T) : Cons[T, Cons[T1, T2]] = Cons(v, this) + def find[T](implicit finder : Cons[T1, T2] => T) = finder(this) + } + + implicit def findFirst[T1, T2 <: Pair] : Cons[T1, T2] => T1 = (p : Cons[T1, T2]) => p._1 + implicit def findSecond[T, T1, T2 <: Pair](implicit finder : T2 => T) : Cons[T1, T2] => T = (p : Cons[T1, T2]) => finder(p._2) + + val p : Cons[Int, Cons[Boolean, End]] = 10 :: false :: End +// val x : Boolean = p.find[Boolean](findSecond(findFirst)) + val x2 : Boolean = p.find[Boolean] // Doesn't compile +} |