[erlang-questions] Bit Syntax and compiler Erlang/OTP R21.1

[Valentin Micic]

Hi all,

Recently I’ve made a silly mistake. I wrote:

case Payload of
   <<_:4/binary-unit:8, _:255, _:7/binary-unit:8, 0:16>>   -> Payload;
   _                                                       -> throw( drop )
end

Instead of:

case Payload of
   <<_:4/binary-unit:8, 255:8, _:7/binary-unit:8, 0:16>>   -> Payload;
   _                                                       -> throw( drop )
end


Considering that overall pattern (which erroneously references 255 bits long field, instead of an octet with a value of 255 ) is not aligned to 8-bit boundary, is it unreasonable to expect the compiler to report this as a potential problem, or  at least generate a warning (support for bit-fields notwithstanding).

What am I missing here?

V/

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://erlang.org/pipermail/erlang-questions/attachments/20190820/f7cd47cc/attachment.htm>