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authorMartin Odersky <odersky@gmail.com>2005-10-06 13:14:33 +0000
committerMartin Odersky <odersky@gmail.com>2005-10-06 13:14:33 +0000
commit25a98964b5109aa55b71a8a26886c59903193548 (patch)
tree84b8fa154b5a0a2f36accd43d8d35926f6ba8579 /test-nsc/files/pos/simplelists.scala
parent3b81e0cbac2fe51226472949ecde4d81b0e95412 (diff)
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Diffstat (limited to 'test-nsc/files/pos/simplelists.scala')
-rwxr-xr-xtest-nsc/files/pos/simplelists.scala17
1 files changed, 17 insertions, 0 deletions
diff --git a/test-nsc/files/pos/simplelists.scala b/test-nsc/files/pos/simplelists.scala
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+++ b/test-nsc/files/pos/simplelists.scala
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+ 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;
+ }
+