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-rw-r--r--test/files/pos/t7750.flags1
-rw-r--r--test/files/pos/t7750.scala8
2 files changed, 9 insertions, 0 deletions
diff --git a/test/files/pos/t7750.flags b/test/files/pos/t7750.flags
new file mode 100644
index 0000000000..b216e74c97
--- /dev/null
+++ b/test/files/pos/t7750.flags
@@ -0,0 +1 @@
+-Xfatal-warnings -feature
diff --git a/test/files/pos/t7750.scala b/test/files/pos/t7750.scala
new file mode 100644
index 0000000000..befec76949
--- /dev/null
+++ b/test/files/pos/t7750.scala
@@ -0,0 +1,8 @@
+trait LazyCombiner[Elem, +To, Buff <: Growable[Elem] with Sizing]
+trait Growable[T]
+trait Sizing
+
+
+object Test {
+ null.isInstanceOf[LazyCombiner[_, _, _]] // issued an existential feature warning
+}