Legal binary syntax?

[Inswitch Solutions - Erlang Evaluation]

Is this a legal binary syntax:

<<Len:16/unsigned, Id1:16/unsigned, Id2:16/unsigned, Pdu:Len/binary>> = Bytes,
where Bytes is a binary.

I received "Len unbound" error message.
If assignment is left to right why does this happen ?


Thanks,
Eduardo Figoli
INSwitch Solutions

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