Revise alias rules in type comparisons.

The fix solves two cases where we had a deep subtype before.

1 files changed, 11 insertions, 0 deletions

diff --git a/tests/pos/sets.scala b/tests/pos/sets.scala
new file mode 100644
index 000000000..577d709f5
--- /dev/null
+++ b/tests/pos/sets.scala
@@ -0,0 +1,11 @@
+object Test {
+
+  val subPatBinders = List[Symbol]()
+
+  def extraStoredBinders: Set[Symbol] = ???
+
+  val storedBinders: Set[Symbol] =
+    (if (true) subPatBinders.toSet else Set.empty) ++ extraStoredBinders// -- ignoredSubPatBinders
+
+
+}