It will have quite interesting implications, especially for former Perl 5 syntax enthusiasts. One could say in Polish they "code in cancer" ("programuje w raku").
No. "Z raku" would mean that "raku" accompanies you and the play on words would be gone because it would be either "programuje z raku" ("one is accompanied by raku the programming language") or "programuje z rakiem" ("codes having/with cancer").