Constant NULL_PROGRAM 

pub const NULL_PROGRAM: &str = "state greeting is client Text starting \"\"\n\
                                \n\
                                view\n\
                                \x20   Column\n\
                                \x20       Input greeting, hint is \"say something\"\n\
                                \x20       Text greeting\n";

The empty-program baseline, in Swift’s shape.

Swift’s was six lines. This is six lines that do the least a ZDeceptron program can do and still be one: hold a value and show it.