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authorPaul Phillips <paulp@improving.org>2011-08-24 17:11:55 +0000
committerPaul Phillips <paulp@improving.org>2011-08-24 17:11:55 +0000
commitb9785280a7138a2bb52060faf94807aa0d07dec1 (patch)
tree870cc1930ac3d50cd07078260f58984224dd39a5 /test/files/pos/t1279a.scala
parent84fcf633d9ca507124806d64729cb8463bcebb69 (diff)
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Renamed tests named bugXXX to tXXX, no review.
Diffstat (limited to 'test/files/pos/t1279a.scala')
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diff --git a/test/files/pos/t1279a.scala b/test/files/pos/t1279a.scala
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+// see #13
+// providing the type parameter in the recursive call to all4Impl
+// avoids the problem
+
+
+// covariant linked list
+abstract class M
+{ self =>
+
+ type T
+ final type selfType = M {type T <: self.T}
+ type actualSelfType >: self.type <: selfType
+
+ def next: selfType
+
+
+ // I don't understand why this doesn't compile, but that's a separate matter
+ // error: method all2 cannot be accessed in M.this.selfType
+ // because its instance type => Stream[M{type T <: M.this.selfType#T}]
+ // contains a malformed type: M.this.selfType#T
+ // def all2: Stream[M {type T <: self.T}] = Stream.cons(self: actualSelfType, next.all2)
+
+
+ // compiles successfully
+ // def all3: Stream[M {type T <: self.T}] = all3Impl(self: actualSelfType)
+ // private def all3Impl(first: M {type T <: self.T}): Stream[M {type T <: self.T}] = Stream.cons(first, all3Impl(first.next))
+
+
+
+ def all4: Stream[M {type T <: self.T}] = Unrelated.all4Impl[T](self: actualSelfType)
+}
+
+object Unrelated
+{
+ // TODO!!! fix this bug for real, it compiles successfully, but weird types are inferred
+ // def all4Impl[U](first: M {type T <: U}): Stream[M {type T <: U}] = Stream.cons(first, all4Impl(first.next))
+
+// compiles successfully
+ def all4Impl[U](first: M {type T <: U}): Stream[M {type T <: U}] = Stream.cons(first, all4Impl[U](first.next))
+}