Using procedures in functions

[Goju-Ryu]

I found myself wishing to be able to call procedures inside a function today. My use case was to set up the arguments of an assert I planned to run in many different variations. I wanted to test mys implementation of human against the existing one and thought I'd write something like the following:

fn test_human(time: Time) = assert_eq(time -> human, time -> human_new)

fn test_human_range(times: List<Time>) = times |> map(test_human)

I think it would be very beneficial for testing if something like the first line at least was possible. The second line is probably a lot more involved, so I won't focus too much on it.

I imagine it might be difficult or undesirable to mix functions and procedures, in which case I would instead propose to introduce custom procedures, a function-like construct that can only call other procedures.