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author | Martin Odersky <odersky@gmail.com> | 2005-10-06 13:14:33 +0000 |
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committer | Martin Odersky <odersky@gmail.com> | 2005-10-06 13:14:33 +0000 |
commit | 25a98964b5109aa55b71a8a26886c59903193548 (patch) | |
tree | 84b8fa154b5a0a2f36accd43d8d35926f6ba8579 /test-nsc/files/pos/List1.scala | |
parent | 3b81e0cbac2fe51226472949ecde4d81b0e95412 (diff) | |
download | scala-25a98964b5109aa55b71a8a26886c59903193548.tar.gz scala-25a98964b5109aa55b71a8a26886c59903193548.tar.bz2 scala-25a98964b5109aa55b71a8a26886c59903193548.zip |
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Diffstat (limited to 'test-nsc/files/pos/List1.scala')
-rwxr-xr-x | test-nsc/files/pos/List1.scala | 45 |
1 files changed, 45 insertions, 0 deletions
diff --git a/test-nsc/files/pos/List1.scala b/test-nsc/files/pos/List1.scala new file mode 100755 index 0000000000..1321d95c20 --- /dev/null +++ b/test-nsc/files/pos/List1.scala @@ -0,0 +1,45 @@ +object lists { + + abstract class List[a] { + def isEmpty: Boolean; + def head: a; + def tail: List[a]; + def prepend(x: a) = Cons[a](x, this); + } + + def Nil[b] = new List[b] { + def isEmpty: Boolean = true; + def head = error("head of Nil"); + def tail = error("tail of Nil"); + } + + def Cons[c](x: c, xs: List[c]): List[c] = new List[c] { + def isEmpty = false; + def head = x; + def tail = xs; + } + + def foo = { + val intnil = Nil[Int]; + val intlist = intnil.prepend(1).prepend(1+1); + val x: Int = intlist.head; + val strnil = Nil[String]; + val strlist = strnil.prepend("A").prepend("AA"); + val y: String = strlist.head; + () + } + + class IntList() extends List[Int] { + def isEmpty: Boolean = false; + def head: Int = 1; + def foo: List[Int] { def isEmpty: Boolean; def head: Int; def tail: List[Int] } = Nil[Int]; + def tail0: List[Int] = foo.prepend(1).prepend(1+1); + def tail: List[Int] = Nil[Int].prepend(1).prepend(1+1); + } + + def foo2 = { + val il1 = new IntList(); + val il2 = il1.prepend(1).prepend(2); + () + } +} |