playground: print send to stdout (server log)

[avelino]

Input:

(print "test")

Output:

>> (print "test")

->

Server log

2018/02/08 19:37:11 Reusing session 87e65a39-8443-4271-8fe3-a5b251ca9407
2018/02/08 19:37:23 currentForm = {map[run:0x6cbcf0 clean:0x6cc1a0]} msgs = [run]
test