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, 10 insertions, 0 deletions

diff --git a/test/files/neg/t8525.scala b/test/files/neg/t8525.scala
new file mode 100644
index 0000000000..7bed04904f
--- /dev/null
+++ b/test/files/neg/t8525.scala
@@ -0,0 +1,10 @@
+
+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
+}