--- a/2-Io/day3-DSL.io	Mon Sep 18 21:08:58 2017 +0100
+++ b/2-Io/day3-DSL.io	Wed Sep 20 20:48:37 2017 +0100
@@ -42,18 +42,36 @@
     )
 )
 
+# Note: Trailing commas break things in COMPLETELY CRYPTIC WAYS
+# This is because we use doString, which executes it as a program,
+# BUT the stack trace doesn't make this clear, so you end up chasing
+# bugs in ENTIRELY THE WRONG PART OF THE CODE.
+# Eval considered harmful.
 the_string := "{
     \"foo\": \"12345\",
-    \"bar\": \"7890\",
+    \"bar\": \"7890\"
 }"
 
 phoneNumbers := doString(the_string)
 phoneNumbers keys println
 phoneNumbers values println
 
+# It feels like implementing something like this should work,
+# but it doesn't because "Number does not respond to ':'"
+# because we assigned ":" as an assignment operator (like :=)
+# and not as a normal operator, although it's then EVEN LESS CLEAR
+# how the code in curlyBrackets works
+# Also, Io Language docs are poor and don't make it clear how to:
+# a) define a range that works; or
+# b) do ANYTHING with the OperatorTable
+Number atPutThing := method(
+    call println
+    return Range (call target) to(call evalArgAt(1))
+)
+
 # But presumably this will break, because there's no "atPutThing" method
 a := 1
 b := 5
-range :=  a : b
+range := a : b
 # Yep - "Exception: Number does not respond to ':'"
 # So you've got to be careful for reusable operators
\ No newline at end of file