Tests -> ("//test" (_ Arg:* _ "=>"):? _ Spec _ "\n"):*
Arg   -> "-l" [a-zA-Z] | "-d" | "--no-purity-check"
Spec  -> "return" _ "-":? [0-9]:+
       | "error_parse"
       | "error_typecheck"
       | "error_static"
       | "error_runtime"
       | "error"
       | "div-by-zero"
       | "aritherror"
       | "infloop"
       | "abort"
       | "segfault"
       | "memerror"
       | "typecheck"

_     -> " " {% nuller %}