diff -r cb2918e02806 -r b0ff6121cb9a progs/lexer/lexer.sc
--- a/progs/lexer/lexer.sc	Tue Sep 15 23:13:45 2020 +0100
+++ b/progs/lexer/lexer.sc	Fri Sep 18 00:33:03 2020 +0100
@@ -32,8 +32,6 @@
 case class Rec(x: String, v: Val) extends Val
    
 // some convenience for typing in regular expressions
-import scala.language.implicitConversions    
-import scala.language.reflectiveCalls
 
 def charlist2rexp(s : List[Char]): Rexp = s match {
   case Nil => ONE