SI-6663: don't ignore type parameter on selectDynamic invocation

Fix mkInvoke to handle selectDynamic calls of the form

  new C.foo[T].xyz

or

  new C.foo[T].xyz :U

(where C extends Dynamic)

Without this patch, the type parameter was silently ignored, and
possibly inferred to a different.

This patch fixes mkInvoke to handle these cases, where ctxTree has
the form Select(TypeApply(fun, targs), nme) or Typed(...)

1 files changed, 19 insertions, 0 deletions

diff --git a/test/files/neg/t6663.scala b/test/files/neg/t6663.scala
new file mode 100644
index 0000000000..4a358dfbc5
--- /dev/null
+++ b/test/files/neg/t6663.scala
@@ -0,0 +1,19 @@
+import language.dynamics
+
+class C(v: Any) extends Dynamic {
+  def selectDynamic[T](n: String): Option[T] = Option(v.asInstanceOf[T])
+  def applyDynamic[T](n: String)(): Option[T] = Option(v.asInstanceOf[T])
+}
+
+object Test extends App {
+  // this should be converted to
+  // C(42).selectDynamic[String]("foo").get
+  // causing a compile error.
+
+  // but, before fixing SI-6663, became
+  // C(42).selectDynamic("foo").get, ignoring
+  // the [String] type parameter
+  var v = new C(42).foo[String].get :Int
+  println(v)
+}
+