1 files changed, 15 insertions, 0 deletions
diff --git a/tests/untried/neg/t1275.scala b/tests/untried/neg/t1275.scala
new file mode 100644
index 000000000..d7513bf09
--- /dev/null
+++ b/tests/untried/neg/t1275.scala
@@ -0,0 +1,15 @@
+object Test {
+  trait Seq[+t] {
+    type MyType[+t] <: Seq[t]
+
+    def f: MyType[t]
+  }
+
+  // illegal abstract type member refinement: changes the arity of MyType
+  // the error is pretty strange, since the compiler forms the illegal type xs.MyType[a] anyway
+  def span[a, s <: Seq[a] { type MyType/*look ma, no type parameters!*/ <: s } ](xs: s): s
+     = xs f
+//        ^
+// found   : xs.MyType[a]
+// required: s
+}