2 files changed, 8 insertions, 0 deletions
diff --git a/test/files/pos/bug3960.flags b/test/files/pos/bug3960.flags
new file mode 100644
index 0000000000..4449dbbdf3
--- /dev/null
+++ b/test/files/pos/bug3960.flags
@@ -0,0 +1 @@
+-Ycheck:typer
+\ No newline at end of file
diff --git a/test/files/pos/bug3960.scala b/test/files/pos/bug3960.scala
new file mode 100644
index 0000000000..5c658e9fbc
--- /dev/null
+++ b/test/files/pos/bug3960.scala
@@ -0,0 +1,7 @@
+class A {
+  class C[x]
+  val cs = new scala.collection.mutable.HashMap[C[_], Int]
+  def c: C[_] = sys.error("")
+  val eval: C[_] = c
+  cs(c) += 1
+}