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authorGilles Dubochet <gilles.dubochet@epfl.ch>2005-12-16 18:29:42 +0000
committerGilles Dubochet <gilles.dubochet@epfl.ch>2005-12-16 18:29:42 +0000
commitdf50e05006b43b007c2587549030d24b5c154398 (patch)
tree9edfb1fb5b8c04350a00c163cfcdb1fccd79e3aa /test/files/pos/List1.scala
parent17e2b1c2a6f69ba74e79c30d1e44195fe732e3e3 (diff)
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'test-nsc' has been moved to 'test'.
Diffstat (limited to 'test/files/pos/List1.scala')
-rw-r--r--test/files/pos/List1.scala45
1 files changed, 45 insertions, 0 deletions
diff --git a/test/files/pos/List1.scala b/test/files/pos/List1.scala
new file mode 100644
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+++ b/test/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);
+ ()
+ }
+}