asFuncDef

    fn asFuncDef(raw: []const u8) FunctionDefinition {
        return .{
            .tag_index = mem.readInt(u32, raw[0..4], .little),
            .total_size = mem.readInt(u32, raw[4..8], .little),
            .pointer_to_linenumber = mem.readInt(u32, raw[8..12], .little),
            .pointer_to_next_function = mem.readInt(u32, raw[12..16], .little),
            .unused = raw[16..18].*,
        };
    }