Fix for SI-6482, lost bounds in extension methods.

That was a good one. How to create a new method with type
parameters from multiple sources, herein.

1 files changed, 11 insertions, 0 deletions

diff --git a/test/files/pos/t6482.scala b/test/files/pos/t6482.scala
new file mode 100644
index 0000000000..24ea38e519
--- /dev/null
+++ b/test/files/pos/t6482.scala
@@ -0,0 +1,11 @@
+final class TraversableOnceOps[+A](val collection: TraversableOnce[A]) extends AnyVal {
+  def reduceLeftOption[B >: A](op: (B, A) => B): Option[B] =
+    if (collection.isEmpty) None else Some(collection.reduceLeft[B](op))
+}
+// error: type arguments [B] do not conform to method reduceLeft's type parameter bounds [B >: A]
+//            if (collection.isEmpty) None else Some(collection.reduceLeft[B](op))
+//                                                                        ^
+
+class Foo[+A <: AnyRef](val xs: List[A]) extends AnyVal {
+  def baz[B >: A](x: B): List[B] = x :: xs
+}