Although I set UTF-8 everywhere (in my lein project, the slime-lisp group customization, the Emacs buffer itself...), I keep getting this error when trying to run code such as (def beta "β"):
Coding system iso-latin-1-unix not suitable [...]
Happens only in Emacs, not when running lein repl from the command line, for instance.
What could be causing it? I'm using Ubuntu, if that makes any difference.
you should have following code in your .emacs:
(setq slime-net-coding-system 'utf-8-unix)
and following in your project.clj when you run lein swank (or setup swank.encoding Java system property to utf-8):
:encoding "utf-8"