[plt-scheme] Is UNICODE in the code taboo?

> No. This sets the entire lang environment, input methods, encodings, etc.
> You want to use something that is recognized as a language env however,
> 'utf-8 is just an encoding.
>
> See the language-info-alist variable for valid language envs.

(mapcar (lambda (linfo) (car linfo)) language-info-alist) =>

("Georgian" "UTF-8" "IPA" "Vietnamese" "Tibetan" "Thai" "Lao" "Korean"
"Japanese" "Windows-1255" "Hebrew" "Greek" "Romanian" "Slovak" "Czech"
"Esperanto" "Brazilian Portuguese" "Croatian" "Swedish" "Latvian"
"Lithuanian" "Latin-7" "Latin-6" "Welsh" "Polish" "Turkish" "Spanish"
"Slovenian" "Italian" "French" "German" "Dutch" "Latin-9" "Latin-8"
"Latin-5" "Latin-4" "Latin-3" "Latin-2" "Latin-1" "Ethiopic" "ASCII"
"English" "Kannada" "Tamil" "Malayalam" "Devanagari" "Belarusian"
"Bulgarian" "Tajik" "Cyrillic-ALT" "Ukrainian" "Russian"
"Cyrillic-KOI8" "Cyrillic-ISO" "Chinese-EUC-TW" "Chinese-CNS"
"Chinese-BIG5" "Chinese-GB")

Thanks everyone.