SI-8525 Add -Xlint:-warn-missing-interpolator

Turn off lint warnings with negating prefix, and add a lint-only
warning for the infamously nagging "Did you forget the interpolator?"

That message is made more dignified.

Without `-Xlint:false`, there is no mechanism to turn off
anonymous linters once `-Xlint` is selected.

1 files changed, 4 insertions, 1 deletions

diff --git a/test/files/neg/t8610.scala b/test/files/neg/t8610.scala
index 494a3354da..7bed04904f 100644
--- a/test/files/neg/t8610.scala
+++ b/test/files/neg/t8610.scala
@@ -1,7 +1,10 @@
 
-case class X(name: String) {
+class Named(var name: String)
+
+class X(name: String) extends Named(name) {
   def x = "Hi, $name"   // missing interp
   def f(p: (Int, Int)): Int = p._1 * p._2
   def g = f(3, 4)       // adapted
   def u: Unit = ()      // unitarian universalist
+  override def toString = name // shadowing mutable var name
 }