Matching binaries in Erlang

Question

For example:

<<Sync:11,B:2,C:2,D:1>> = <<2#1111111111101011>>.
** exception error: no match of right hand side value

Why? I think variable Sync must be 2#11111111111 but it's not.

Answer 1

it will work if you will specify number of bits in right hand side

<<Sync:11,B:2,C:2,D:1>> = <<2#1111111111101011:16>>.