diff --git a/tests/pos/i4988.scala b/tests/pos/i4988.scala
new file mode 100644
index 000000000000..d35304fc7c9d
--- /dev/null
+++ b/tests/pos/i4988.scala
@@ -0,0 +1,15 @@
+object Trees {
+  class PackageDef
+  class ValDef
+}
+
+class ReplCompiler {
+  type PackageDef = Trees.PackageDef
+  type ValDef = Trees.ValDef
+
+  def errors[A]: A = ???
+  def success: ValDef = ???
+
+  def typeCheck(cond: Boolean): ValDef =
+    if (cond) success else errors // failure goes away with `errors[ValDef]`
+}