Disallow wildcard arguments to higher-kinded types...

...unless the HK type can be eta-reduced to a class type.

1 files changed, 34 insertions, 1 deletions

diff --git a/tests/pos/partialApplications.scala b/tests/pos/partialApplications.scala
index c1df1dee2..285dc8661 100644
--- a/tests/pos/partialApplications.scala
+++ b/tests/pos/partialApplications.scala
@@ -8,6 +8,39 @@ object Test {
 
   val ys: StringlyHistogram[String] = xs
 
-  val zs: StringlyHistogram = xs
+  def e = xs
+
+  val zs: StringlyHistogram[_] = e
+
+  type IntMap[Y] = Map[Int, Y]
+
+  val is = Map[Int, Boolean]()
+
+  val js: IntMap[Boolean] = is
+
+  val ks: IntMap[_] = is
+
+  type RMap[X, Y] = Map[Y, X]
+
+  val rs = Map[Int, Float]()
+
+  val ss: RMap[Float, Int] = rs
+
+}
+
+object Test2 {
+  type Histogram = Map[_, Int]
+
+  type StringlyHistogram = Histogram[_ >: String] // error
+
+  val xs: Histogram[String] = Map[String, Int]() // error
+
+  val ys: StringlyHistogram[String] = xs // error
+
+  val zs: StringlyHistogram = xs // error
+
+  val xs1 = xs
+  val ys1 = ys
+  val zs1 = zs
 
 }