1 files changed, 7 insertions, 0 deletions
diff --git a/tests/untried/neg/t6788.scala b/tests/untried/neg/t6788.scala
new file mode 100644
index 000000000..77949ed62
--- /dev/null
+++ b/tests/untried/neg/t6788.scala
@@ -0,0 +1,7 @@
+case class B[T](b: T, a: List[Int]) // need two args, B must be polymorphic
+
+class A {
+  var s: B[Int] = _ // has to be a var
+
+  s.copy(b = foo)
+}