diff -r ac79c2e534bd -r b528d1d3d3c3 core_testing3/postfix_test.sh
--- a/core_testing3/postfix_test.sh	Thu Nov 02 12:37:58 2023 +0000
+++ b/core_testing3/postfix_test.sh	Thu Nov 02 13:53:37 2023 +0000
@@ -9,26 +9,26 @@
 echo -e "Below is the feedback for your submission postfix.scala and postfix2.scala" >> $out
 echo -e "" >> $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)
 }
 
 
-
 # compilation test
 
 echo -e "postfix.scala runs?" >> $out
@@ -38,7 +38,8 @@
     echo -e "  --> passed" >> $out
     tsts=$(( 0 ))
   else
-    echo -e "  --> SCALA DID NOT RUN postfix.scala\n" >> $out
+      echo -e "  --> SCALA DID NOT RUN postfix.scala\n" >> $out
+      echo -e "  --> try running scala-cli compile postfix.scala on your own computer\n" >> $out
     tsts=$(( 1 )) 
 fi
 
@@ -69,7 +70,7 @@
   echo -e " syard(split(\"5 + 7 / 2\")) == List(\"5\", \"7\", \"2\", \"/\", \"+\")" >> $out
   echo -e " syard(split(\"5 * 7 / 2\")) == List(\"5\", \"7\", \"\*\", \"2\", \"/\")" >> $out
   
-  if (scala_assert "postfix.scala" "postfix_test7.scala")
+  if (scala_assert "postfix.scala" "postfix_test1.scala")
   then
     echo -e "  --> success" >> $out
   else
@@ -88,7 +89,7 @@
   echo -e " compute(syard(split(\"5 * 7 / 2\"))) == 17" >> $out
   echo -e " compute(syard(split(\"9 + 24 / ( 7 - 3 )\"))) == 15" >> $out
   
-  if (scala_assert "postfix.scala" "postfix_test8.scala")
+  if (scala_assert "postfix.scala" "postfix_test2.scala")
   then
     echo -e "  --> success" >> $out
   else
@@ -111,6 +112,7 @@
     tsts1=$(( 0 ))
 else
     echo -e "  --> SCALA DID NOT RUN postfix2.scala\n" >> $out
+    echo -e "  --> try running scala-cli compile postfix2.scala on your own computer\n" >> $out
     tsts1=$(( 1 )) 
 fi
 
@@ -152,7 +154,7 @@
   echo -e " compute(syard(split(\"( 4 ^ 3 ) ^ 2\"))) == 4096" >> $out
   echo -e " compute(syard(split(\"( 3 + 1 ) ^ 2 ^ 3\"))) == 65536" >> $out
   
-  if (scala_assert "postfix2.scala" "postfix_test9.scala")
+  if (scala_assert "postfix2.scala" "postfix_test3.scala")
   then
     echo -e "  --> success" >> $out
   else