1 files changed, 46 insertions, 0 deletions
diff --git a/test/pending/neg/tcpoly_typealias_eta.scala b/test/pending/neg/tcpoly_typealias_eta.scala
new file mode 100644
index 0000000000..767dfe311c
--- /dev/null
+++ b/test/pending/neg/tcpoly_typealias_eta.scala
@@ -0,0 +1,46 @@
+trait A {
+  type m[+x]
+}
+
+trait A2 {
+  type m[+x <: String]
+}
+
+trait A3 {
+  type m[x]
+}
+
+trait FooCov[+x]
+trait FooCon[-x]
+trait FooBound[+x <: String]
+
+trait BOk1 extends A {
+  type m/*[+x]*/ = FooCov/*[x]*/
+}
+
+trait BOk2 extends A2 {
+  type m/*[+x <: String]*/ = FooBound/*[x]*/
+}
+
+trait BOk3 extends A2 {
+  type m/*[+x]*/ = FooCov/*[x]*/ // weaker bound
+}
+
+trait BOk4 extends A3 {
+  type m/*[+x]*/ = FooCov/*[x]*/ // weaker variance
+}
+
+// there are two aspects to check:
+ // does type alias signature (not considering RHS) correspond to abstract type member in super class
+ // does RHS correspond to the type alias sig
+trait BInv extends A{
+  type m/*[x]*/ = FooCov/*[x]*/ // error: invariant x in alias def
+}
+
+trait BCon extends A{
+  type m/*[-x]*/ = FooCon/*[x]*/ // error: contravariant x
+}
+
+trait BBound extends A{
+  type m/*[+x <: String]*/ = FooBound/*[x]*/ // error: x with stricter bound
+}
+\ No newline at end of file