Update compiler/src/dotty/tools/dotc/config/Printers.scala

Co-Authored-By: odersky <[email protected]>

Author: franktominc

compiler/src/dotty/tools/dotc/config/Printers.scala

@@ -17,7 +17,7 @@ object Printers {
   val checks: Printer = noPrinter
   val config: Printer = noPrinter
   val cyclicErrors: Printer = noPrinter
-  val debug = noPrinter
+  val debug: Printer = noPrinter
   val dottydoc: Printer = noPrinter
   val exhaustivity: Printer = noPrinter
   val gadts: Printer = noPrinter