SI-5683 Fail gracefully when transposing a ragged type arg matrix.

The code used to do this, until `transpose` starting throwing IAE
rather than AIOOBE.

Symptomatic treatment only: The reported crasher now infers ill-kinded
type args and reports an error.

1 files changed, 16 insertions, 0 deletions

diff --git a/test/files/neg/t5683.check b/test/files/neg/t5683.check
new file mode 100644
index 0000000000..7c0e50113c
--- /dev/null
+++ b/test/files/neg/t5683.check
@@ -0,0 +1,16 @@
+t5683.scala:12: error: inferred kinds of the type arguments (Object,Int) do not conform to the expected kinds of the type parameters (type M,type B).
+Object's type parameters do not match type M's expected parameters:
+class Object has no type parameters, but type M has one
+  val crash: K[StringW,Int,Int] = k{ (y: Int) => null: W[String, Int] }
+                                  ^
+t5683.scala:12: error: type mismatch;
+ found   : Int => Test.W[String,Int]
+ required: Int => M[B]
+  val crash: K[StringW,Int,Int] = k{ (y: Int) => null: W[String, Int] }
+                                              ^
+t5683.scala:12: error: type mismatch;
+ found   : Test.K[M,Int,B]
+ required: Test.K[Test.StringW,Int,Int]
+  val crash: K[StringW,Int,Int] = k{ (y: Int) => null: W[String, Int] }
+                                   ^
+three errors found