Get a decent editor that color-codes program source

Too true. But when I'm on the go, reading a printout, yes I do that, it does not help.

Solutions:

• Get the editor to print its syntax colouring (or dump colouring to html) and print in colour
• Get a highlighter and do it manually. Added bonus: it'll be done just the way you want it and you'll know up to where you've read.

Ok, dump Perl and try Lisp ;-)

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print+qq(\L@{[ref\&@]}@{['@'x7^'!#2/"!4']});