SI-6567 Warning for Option(implicitView(foo))

I've seen the reported problem before in the wild. It seems
worthy of a special warning, so long as we advocate Option.apply
as an alternative to `if (x == null) Some(x) else None`.

It is behind -Xlint at the moment, an option that could do with
some promotion.

1 files changed, 11 insertions, 0 deletions

diff --git a/test/files/neg/t6567.scala b/test/files/neg/t6567.scala
new file mode 100644
index 0000000000..650e5e39ae
--- /dev/null
+++ b/test/files/neg/t6567.scala
@@ -0,0 +1,11 @@
+class A
+class B
+
+object Test {
+  val a: A = null
+  implicit def a2b(a: A) = new B
+
+  Option[B](a)
+
+  val b: Option[B] = Option(a)
+}