diff -r 8fb3b6d3be70 -r 81ee93b87258 progs/while-arrays/compile_arrays2.sc
--- a/progs/while-arrays/compile_arrays2.sc	Thu Jan 20 08:58:38 2022 +0000
+++ b/progs/while-arrays/compile_arrays2.sc	Mon Jan 24 00:00:33 2022 +0000
@@ -231,7 +231,14 @@
 //    java arr/arr
 
 // automating the above
-import ammonite.ops._
+
+// pre-2.5.0 ammonite 
+// import ammonite.ops._
+
+// post 2.5.0 ammonite
+import $ivy.`com.lihaoyi::os-lib:0.8.0` 
+import os._
+
 
 def compile_to_file(bl: Block, class_name: String) : Unit = 
   write.over(pwd / s"$class_name.j", compile(bl, class_name))