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Diffstat (limited to 'tests/untried/neg/tailrec-2.scala')
-rw-r--r-- | tests/untried/neg/tailrec-2.scala | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/tests/untried/neg/tailrec-2.scala b/tests/untried/neg/tailrec-2.scala new file mode 100644 index 000000000..d6b8b1355 --- /dev/null +++ b/tests/untried/neg/tailrec-2.scala @@ -0,0 +1,29 @@ +sealed abstract class Super[+A] { + def f[B >: A](mem: List[B]) : List[B] + def g(mem: List[_]) = ??? +} +// This one should fail, target is a supertype +class Bop1[+A](val element: A) extends Super[A] { + + @annotation.tailrec final def f[B >: A](mem: List[B]): List[B] = (null: Super[A]).f(mem) + @annotation.tailrec final def f1[B >: A](mem: List[B]): List[B] = this.g(mem) +} +// These succeed +class Bop2[+A](val element: A) extends Super[A] { + @annotation.tailrec final def f[B >: A](mem: List[B]): List[B] = (null: Bop2[A]).f(mem) +} +object Bop3 extends Super[Nothing] { + @annotation.tailrec final def f[B](mem: List[B]): List[B] = (null: Bop3.type).f(mem) +} +class Bop4[+A](val element: A) extends Super[A] { + @annotation.tailrec final def f[B >: A](mem: List[B]): List[B] = Other.f[A].f(mem) +} + +object Other { + def f[T] : Bop4[T] = sys.error("") +} + +object Bop { + def m1[A] : Super[A] = sys.error("") + def m2[A] : Bop2[A] = sys.error("") +} |