--- a/solution/cw5/fun_tokens.sc	Thu Jan 20 08:58:38 2022 +0000
+++ b/solution/cw5/fun_tokens.sc	Mon Jan 24 00:00:33 2022 +0000
@@ -195,7 +195,7 @@
           "w" | "x" | "y" | "z" | "A" | "B" | "C" | "D" |"E" | "F" | "G" |
           "H" | "I" | "J" | "K" |"L" | "M" | "N" |
           "O" | "P" | "Q" | "R" |"S" | "T" | "U" |
-          "V" | "W" | "X" | "Y" | "Z" | "_"
+          "V" | "W" | "X" | "Y" | "Z" | "_" | ":"
 val DIGIT = "0" | "1" | "2" | "3" | "4" | "5" | "6" | "7" | "8" | "9"
 val ID = SYM ~ (SYM | DIGIT).% 
 val NUM = PLUS(DIGIT)