Implement end markers

Author: odersky

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

@@ -27,6 +27,7 @@ object Printers {
   val hk: Printer = noPrinter
   val implicits: Printer = noPrinter
   val implicitsDetailed: Printer = noPrinter
+  val lexical: Printer = noPrinter
   val inlining: Printer = noPrinter
   val interactiv: Printer = noPrinter
   val overload: Printer = noPrinter

compiler/src/dotty/tools/dotc/core/StdNames.scala

@@ -420,6 +420,7 @@ object StdNames {
     val elem: N                 = "elem"
     val elems: N                = "elems"
     val emptyValDef: N          = "emptyValDef"
+    val end: N                  = "end"
     val ensureAccessible : N    = "ensureAccessible"
     val eq: N                   = "eq"
     val eqInstance: N           = "eqInstance"