   and matching. To see optimization output, set the `bin_opt_info` compiler
   option:
 
-      `ERL_COMPILER_OPTIONS=bin_opt_info mix compile`
+      ERL_COMPILER_OPTIONS=bin_opt_info mix compile
 
   To learn more about specific optimizations and performance considerations,
   check out
   [Erlang's Efficiency Guide on handling binaries](http://www.erlang.org/doc/efficiency_guide/binaryhandling.html).
-
-
   """
   defmacro unquote(:<<>>)(args)
 

      iex> <<"foo" :: utf32>>
      <<0, 0, 0, 102, 0, 0, 0, 111, 0, 0, 0, 111>>


  ## Options

  Many options can be given by using `-` as separator. Order is

  binary32 and binary64, respectively.

  For binaries, the default is the size of the binary. Only the last binary in a
  match can use the default size. All others must have their size specified
  explicitly, even if the match is unambiguous. For example:

      iex> <<name::binary-size(5), " the ", species::binary>> = <<"Frank the Walrus">>
      "Frank the Walrus"
      iex> {name, species}
      {"Frank", "Walrus"}

  Failing to specify the size for the non-last causes compilation to fail:
  
      <<name::binary, " the ", species::binary>> = <<"Frank the Walrus">>
      ** (CompileError): a binary field without size is only allowed at the end of a binary pattern

  #### Shortcut Syntax

