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Diffstat (limited to 'test-nsc/files/pos/simplelists.scala')
-rwxr-xr-x | test-nsc/files/pos/simplelists.scala | 17 |
1 files changed, 17 insertions, 0 deletions
diff --git a/test-nsc/files/pos/simplelists.scala b/test-nsc/files/pos/simplelists.scala new file mode 100755 index 0000000000..73b04a8762 --- /dev/null +++ b/test-nsc/files/pos/simplelists.scala @@ -0,0 +1,17 @@ + abstract class List[+a] { + def head: a; + def tail: List[a]; + def cons[b >: a](x: b): List[b] = new Cons[b, a](x, this); + } + + object Nil extends List[All] { + def error(msg: String): All = throw new java.lang.Error(msg); + def head: All = error("Nil.head"); + def tail: List[All] = error("Nil.tail"); + } + + class Cons[c, d <: c](x: c, xs: List[d]) extends List[c] { + def head: c = x; + def tail: List[c] = xs; + } + |