errors/code.go
func Range(start uint32, end uint32) func(uint32) Code {
	if end <= start {
		panic("Range end <= start")
	}

	return func(i uint32) Code {
		if i >= (end - start) {
			panic(fmt.Sprintf("Code %v does not fit in range [%v, %v[", i, start, end))
		}

		return Code(start + i)
	}
}
func Range(start uint32, end uint32) func(uint32) Code {
	if end <= start {
		panic("Range end <= start")
	}

	return func(i uint32) Code {
		if i >= (end - start) {
			panic(fmt.Sprintf("Code %v does not fit in range [%v, %v[", i, start, end))
		}

		return Code(start + i)
	}
}
// Range is a utility function that creates a code builder.
//
// Example:
//	var code = Range(1000, 2000)
//  var ErrSomethingWasWrong := &ErrDescriptor{
//		// ...
//		Code: code(77),
//  }
//
// This can be used to create disjunct code ranges and be strict about it.
// The codes created by the returned function will range from start (inclusive)
// to end (exclusive) or the function will panic otherwise.