Merge pull request #1465 from dotty-staging/fix-#1457

Fix #1457: Three incompatbilities with scalac

2 files changed, 24 insertions, 0 deletions

diff --git a/tests/disabled/not-representable/hkt/compiler.error b/tests/disabled/not-representable/hkt/compiler.error
new file mode 100644
index 000000000..b31760891
--- /dev/null
+++ b/tests/disabled/not-representable/hkt/compiler.error
@@ -0,0 +1,6 @@
+$ scalac tests/pending/hkt/*.scala
+$ ./bin/dotc tests/pending/hkt/*.scala
+tests/pending/hkt/hkt.scala:14: error: method empty in object Child does not take type parameters
+  Child.empty[Int]
+             ^
+one error found
diff --git a/tests/disabled/not-representable/hkt/hkt.scala b/tests/disabled/not-representable/hkt/hkt.scala
new file mode 100644
index 000000000..1a9932d73
--- /dev/null
+++ b/tests/disabled/not-representable/hkt/hkt.scala
@@ -0,0 +1,18 @@
+// This one is unavoidable. Dotty does not allow several overloaded
+// parameterless methods, so it picks the one in the subclass.
+
+import scala.language.higherKinds
+// Minimal reproduction for:
+// scala.collection.mutable.ArrayStack.empty[Int]
+
+abstract class Super[C[_]] {
+  def empty[T]: C[T] = ???
+}
+
+class Child[T]
+
+object Child extends Super[Child] {
+  def empty: Child[Nothing] = new Child()
+
+  Child.empty[Int]
+}