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author | Adriaan Moors <adriaan.moors@epfl.ch> | 2012-06-03 14:15:30 -0700 |
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committer | Adriaan Moors <adriaan.moors@epfl.ch> | 2012-06-03 14:15:30 -0700 |
commit | b34313db72b7c42fb403677487bd9ac00257993e (patch) | |
tree | 520fb709066f01bb73a6fa2f2ed900c20ba118ec /test/files/neg/t5683.scala | |
parent | 09f0814d2fbad488e92c60d7df363d12f350d869 (diff) | |
parent | 80d986997e58b5195654b6f9ca8cd81bc62f4bbf (diff) | |
download | scala-b34313db72b7c42fb403677487bd9ac00257993e.tar.gz scala-b34313db72b7c42fb403677487bd9ac00257993e.tar.bz2 scala-b34313db72b7c42fb403677487bd9ac00257993e.zip |
Merge pull request #661 from retronym/ticket/5683
SI-5683 Fail gracefully when transposing a ragged type arg matrix.
Diffstat (limited to 'test/files/neg/t5683.scala')
-rw-r--r-- | test/files/neg/t5683.scala | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/test/files/neg/t5683.scala b/test/files/neg/t5683.scala new file mode 100644 index 0000000000..05ab035792 --- /dev/null +++ b/test/files/neg/t5683.scala @@ -0,0 +1,23 @@ +object Test { + trait NT[X] + trait W[W, A] extends NT[Int] + type StringW[T] = W[String, T] + trait K[M[_], A, B] + + def k[M[_], B](f: Int => M[B]): K[M, Int, B] = null + + val okay1: K[StringW,Int,Int] = k{ (y: Int) => null: StringW[Int] } + val okay2 = k[StringW,Int]{ (y: Int) => null: W[String, Int] } + + val crash: K[StringW,Int,Int] = k{ (y: Int) => null: W[String, Int] } + + // remove `extends NT[Int]`, and the last line gives an inference error + // rather than a crash. + // test/files/pos/t5683.scala:12: error: no type parameters for method k: (f: Int => M[B])Test.K[M,Int,B] exist so that it can be applied to arguments (Int => Test.W[String,Int]) + // --- because --- + // argument expression's type is not compatible with formal parameter type; + // found : Int => Test.W[String,Int] + // required: Int => ?M[?B] + // val crash: K[StringW,Int,Int] = k{ (y: Int) => null: W[String, Int] } + // ^ +} |