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author | Martin Odersky <odersky@gmail.com> | 2009-02-23 19:21:05 +0000 |
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committer | Martin Odersky <odersky@gmail.com> | 2009-02-23 19:21:05 +0000 |
commit | bf35b888e49afb245883571cc00cbb5ec7341f24 (patch) | |
tree | 8c060484dde8c122f1d65fceedf0dd962a4ad90c /test/files/pos | |
parent | a4baf48a5fb38f29d462accc57f93032955efa0e (diff) | |
download | scala-bf35b888e49afb245883571cc00cbb5ec7341f24.tar.gz scala-bf35b888e49afb245883571cc00cbb5ec7341f24.tar.bz2 scala-bf35b888e49afb245883571cc00cbb5ec7341f24.zip |
fixed several problems with cyclic references u...
fixed several problems with cyclic references uncovered by experimenting
with collections. Added early type definitions.
Diffstat (limited to 'test/files/pos')
-rw-r--r-- | test/files/pos/bug1279a.scala | 38 | ||||
-rw-r--r-- | test/files/pos/t0674.scala | 7 |
2 files changed, 42 insertions, 3 deletions
diff --git a/test/files/pos/bug1279a.scala b/test/files/pos/bug1279a.scala new file mode 100644 index 0000000000..7568d3afcd --- /dev/null +++ b/test/files/pos/bug1279a.scala @@ -0,0 +1,38 @@ +// 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 +{ + 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)) +} diff --git a/test/files/pos/t0674.scala b/test/files/pos/t0674.scala index 2bd9d9a9db..c3d2cc7476 100644 --- a/test/files/pos/t0674.scala +++ b/test/files/pos/t0674.scala @@ -41,7 +41,8 @@ for(a <- Some(1); n <- Some(14); o <- Some(15); p <- Some(16); - q <- Some(17); - r <- Some(18); - s <- Some(19)) yield a) + q <- Some(17) +// r <- Some(18); +// s <- Some(19) + ) yield a) } |