diff -r 6a77c260c8a5 -r ac79c2e534bd core_testing2/docdiff_test.sh
--- a/core_testing2/docdiff_test.sh	Thu Nov 02 11:32:10 2023 +0000
+++ b/core_testing2/docdiff_test.sh	Thu Nov 02 12:37:58 2023 +0000
@@ -11,23 +11,22 @@
 echo "Below is the feedback for your submission docdiff.scala" >> $out
 echo "" >> $out
 
-
 # compilation tests
 
 function scala_compile {
-  (ulimit -t 30; JAVA_OPTS="-Xmx1g" scala -Xprint:parser "$1" 2> c$out 1> c$out)
+  (ulimit -t 30; JAVA_OPTS="-Xmx1g" scala-cli compile "$1" 2> c$out 1> c$out)
 }
 
 # functional tests
 
 function scala_assert {
-  (ulimit -t 30; JAVA_OPTS="-Xmx1g" scala -i "$1" -- "$2" -e "" 2> /dev/null 1> /dev/null)
+  (ulimit -t 30; JAVA_OPTS="-Xmx1g" scala-cli -i "$1" "$2" -e "urbanmain()" 2> /dev/null 1> /dev/null)
 }
 
 # purity test
-
 function scala_vars {
-   (egrep '\bvar\b|\breturn\b|\.par\.|\.par |ListBuffer|AtomicInteger|mutable|util.control|new Array' c$out 2> /dev/null 1> /dev/null)
+   (sed 's/immutable/ok/g' c$out > cb$out;
+    egrep '\bvar\b|\breturn\b|\.par\.|\.par |ListBuffer|AtomicInteger|mutable|util.control|new Array' cb$out 2> /dev/null 1> /dev/null)
 }
 
 
@@ -42,6 +41,7 @@
     tsts=$(( 0 ))
 else
     echo -e "  --> SCALA DID NOT RUN docdiff.scala\n" >> $out
+    echo -e "  --> try running scala-cli compile docdiff.scala on your own computer\n" >> $out
     tsts=$(( 1 )) 
 fi