0: Error: failed to fill whole buffer
           len = 6
     at binrw/tests/error/backtrace_2.rs:10
 1: While parsing the innerest most struct
     at binrw/tests/error/backtrace_2.rs:17
 2: While parsing field '_middle' in OutermostStruct
     at binrw/tests/error/backtrace_2.rs:23