diff options
Diffstat (limited to 'tests/pos')
-rw-r--r-- | tests/pos/t1279a.scala | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/tests/pos/t1279a.scala b/tests/pos/t1279a.scala new file mode 100644 index 000000000..18b1e53f4 --- /dev/null +++ b/tests/pos/t1279a.scala @@ -0,0 +1,39 @@ +// 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) +} + +// TODO!!! fix this bug for real, it compiles successfully, but weird types are inferred +object Unrelated { + // compiles successfully + def all4Impl[U](first: M {type T <: U}): Stream[M {type T <: U}] = Stream.cons(first, all4Impl[U](first.next)) + + // should compile successfully without the [U], but: + // def all4ImplFail[U](first: M {type T <: U}): Stream[M {type T <: U}] = Stream.cons(first, all4ImplFail(first.next)) + // + // test/files/pos/t1279a.scala:31: error: type mismatch; + // found : first.selfType + // (which expands to) M{type T <: first.T} + // required: M{type T <: Nothing} + // def all4ImplFail[U](first: M {type T <: U}): Stream[M {type T <: U}] = Stream.cons(first, all4ImplFail(first.next)) + // ^ + // one error found +} |