pub const Slice = struct {
    buffer: []const u8,
    num: usize,
    count: usize = 0,

    /// Lives as long as Symtab instance.
    pub fn next(self: *Slice) ?Symbol {
        if (self.count >= self.num) return null;
        const sym = asSymbol(self.buffer[0..Symbol.sizeOf()]);
        self.count += 1;
        self.buffer = self.buffer[Symbol.sizeOf()..];
        return sym;
    }
}