ERROR: setfield! immutable struct of type MyTime cannot be changed

[WenjieZ]

In Chapter 16, the Modifiers section, you have the following code:

function increment!(time, seconds)
    time.second += seconds
    if time.second >= 60
        time.second -= 60
        time.minute += 1
    end
    if time.minute >= 60
        time.minute -= 60
        time.hour += 1
    end
end

This won't work because MyTime is previously defined as an immutable struct.

[BenLauwens]

Good remark! I have to introduce a mutable MyTime type;)