Fix #2064: Avoid illegal types in OrDominator

Need to skip type bounds in `underlying` chain, since
TypeBounds is not a legal operand type for OrType.

1 files changed, 15 insertions, 0 deletions

diff --git a/tests/pos/i2064.scala b/tests/pos/i2064.scala
new file mode 100644
index 000000000..909923372
--- /dev/null
+++ b/tests/pos/i2064.scala
@@ -0,0 +1,15 @@
+object p {
+
+class Foo[T] {
+  // Crashes:
+  def f(): Foo[T] = (if (true) this else this).bar
+
+  // Works:
+  // def f(): Foo[T] = new Bar(if (true) this else this).bar
+}
+
+implicit class Bar[A](val self: A) {
+  def bar(): A = self
+}
+
+}