SI-6844 restrict splicing in parameter position

Previously were a bit too permissive on how splicing in function
parameter position worked. This made confusing things like
possible:

   val x = TermName(“x”)
   q”def foo($x)”

Now you can either splice trees in that position (ValDefs) or
you have to provide type if you splice a name.

1 files changed, 5 insertions, 0 deletions

diff --git a/test/files/neg/t6844.scala b/test/files/neg/t6844.scala
new file mode 100644
index 0000000000..809d9d0f98
--- /dev/null
+++ b/test/files/neg/t6844.scala
@@ -0,0 +1,5 @@
+import scala.reflect.runtime.universe._
+object Test extends App {
+  val x = TermName("x")
+  q"def foo($x)"
+}