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author | Paul Phillips <paulp@improving.org> | 2012-09-25 18:11:29 -0700 |
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committer | Paul Phillips <paulp@improving.org> | 2012-09-25 18:21:33 -0700 |
commit | 9d423c9bb76dddcd080d98f4a05c02856708fc06 (patch) | |
tree | 764110f7277097e6acdc6efe5ce44040decd5fcc /test/files/neg/unchecked2.check | |
parent | 5499e41157cdb6a81772728525e9c1f44401e7cc (diff) | |
download | scala-9d423c9bb76dddcd080d98f4a05c02856708fc06.tar.gz scala-9d423c9bb76dddcd080d98f4a05c02856708fc06.tar.bz2 scala-9d423c9bb76dddcd080d98f4a05c02856708fc06.zip |
Improvements to unchecked warnings.
Closes SI-6275, SI-5762.
The comment says is better than I can.
/** On pattern matcher checkability:
*
* Consider a pattern match of this form: (x: X) match { case _: P => }
*
* There are four possibilities to consider:
* [P1] X will always conform to P
* [P2] x will never conform to P
* [P3] X <: P if some runtime test is true
* [P4] X cannot be checked against P
*
* The first two cases correspond to those when there is enough static
* information to say X <: P or that !(X <: P) for all X and P.
* The fourth case includes unknown abstract types or structural
* refinements appearing within a pattern.
*
* The third case is the interesting one. We designate another type, XR,
* which is essentially the intersection of X and |P|, where |P| is
* the erasure of P. If XR <: P, then no warning is emitted.
*
* Examples of how this info is put to use:
* sealed trait A[T] ; class B[T] extends A[T]
* def f(x: B[Int]) = x match { case _: A[Int] if true => }
* def g(x: A[Int]) = x match { case _: B[Int] => }
*
* `f` requires no warning because X=B[Int], P=A[Int], and B[Int] <:< A[Int].
* `g` requires no warning because X=A[Int], P=B[Int], XR=B[Int], and B[Int] <:< B[Int].
* XR=B[Int] because a value of type A[Int] which is tested to be a B can
* only be a B[Int], due to the definition of B (B[T] extends A[T].)
*
* This is something like asSeenFrom, only rather than asking what a type looks
* like from the point of view of one of its base classes, we ask what it looks
* like from the point of view of one of its subclasses.
*/
Diffstat (limited to 'test/files/neg/unchecked2.check')
-rw-r--r-- | test/files/neg/unchecked2.check | 60 |
1 files changed, 42 insertions, 18 deletions
diff --git a/test/files/neg/unchecked2.check b/test/files/neg/unchecked2.check index e37865928e..0ff2a249a8 100644 --- a/test/files/neg/unchecked2.check +++ b/test/files/neg/unchecked2.check @@ -1,19 +1,43 @@ -unchecked2.scala:2: error: non-variable type argument Int in type Option[Int] is unchecked since it is eliminated by erasure - Some(123).isInstanceOf[Option[Int]] - ^ -unchecked2.scala:3: error: non-variable type argument String in type Option[String] is unchecked since it is eliminated by erasure - Some(123).isInstanceOf[Option[String]] - ^ unchecked2.scala:4: error: non-variable type argument List[String] in type Option[List[String]] is unchecked since it is eliminated by erasure - Some(123).isInstanceOf[Option[List[String]]] - ^ -unchecked2.scala:5: error: non-variable type argument List[Int => String] in type Option[List[Int => String]] is unchecked since it is eliminated by erasure - Some(123).isInstanceOf[Option[List[Int => String]]] - ^ -unchecked2.scala:6: error: non-variable type argument (String, Double) in type Option[(String, Double)] is unchecked since it is eliminated by erasure - Some(123).isInstanceOf[Option[(String, Double)]] - ^ -unchecked2.scala:7: error: non-variable type argument String => Double in type Option[String => Double] is unchecked since it is eliminated by erasure - Some(123).isInstanceOf[Option[String => Double]] - ^ -6 errors found + /* warn */ Some(List(1)).isInstanceOf[Option[List[String]]] + ^ +unchecked2.scala:5: error: non-variable type argument Option[_] in type Option[Option[_]] is unchecked since it is eliminated by erasure + /* warn */ Some(123).isInstanceOf[Option[Option[_]]] + ^ +unchecked2.scala:6: error: non-variable type argument String in type Option[String] is unchecked since it is eliminated by erasure + /* warn */ Some(123).isInstanceOf[Option[String]] + ^ +unchecked2.scala:7: error: non-variable type argument List[String] in type Option[List[String]] is unchecked since it is eliminated by erasure + /* warn */ Some(123).isInstanceOf[Option[List[String]]] + ^ +unchecked2.scala:8: error: non-variable type argument List[Int => String] in type Option[List[Int => String]] is unchecked since it is eliminated by erasure + /* warn */ Some(123).isInstanceOf[Option[List[Int => String]]] + ^ +unchecked2.scala:9: error: non-variable type argument (String, Double) in type Option[(String, Double)] is unchecked since it is eliminated by erasure + /* warn */ Some(123).isInstanceOf[Option[(String, Double)]] + ^ +unchecked2.scala:10: error: non-variable type argument String => Double in type Option[String => Double] is unchecked since it is eliminated by erasure + /* warn */ Some(123).isInstanceOf[Option[String => Double]] + ^ +unchecked2.scala:14: error: non-variable type argument List[String] in type Option[List[String]] is unchecked since it is eliminated by erasure + /* warn */ (Some(List(1)): Any).isInstanceOf[Option[List[String]]] + ^ +unchecked2.scala:15: error: non-variable type argument Int in type Option[Int] is unchecked since it is eliminated by erasure + /* warn */ (Some(123): Any).isInstanceOf[Option[Int]] + ^ +unchecked2.scala:16: error: non-variable type argument String in type Option[String] is unchecked since it is eliminated by erasure + /* warn */ (Some(123): Any).isInstanceOf[Option[String]] + ^ +unchecked2.scala:17: error: non-variable type argument List[String] in type Option[List[String]] is unchecked since it is eliminated by erasure + /* warn */ (Some(123): Any).isInstanceOf[Option[List[String]]] + ^ +unchecked2.scala:18: error: non-variable type argument List[Int => String] in type Option[List[Int => String]] is unchecked since it is eliminated by erasure + /* warn */ (Some(123): Any).isInstanceOf[Option[List[Int => String]]] + ^ +unchecked2.scala:19: error: non-variable type argument (String, Double) in type Option[(String, Double)] is unchecked since it is eliminated by erasure + /* warn */ (Some(123): Any).isInstanceOf[Option[(String, Double)]] + ^ +unchecked2.scala:20: error: non-variable type argument String => Double in type Option[String => Double] is unchecked since it is eliminated by erasure + /* warn */ (Some(123): Any).isInstanceOf[Option[String => Double]] + ^ +14 errors found |