bit-buf 0.3.0

I needed this.
Documentation 
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use core::fmt::{self, Display};

/// Error from checked operations
#[derive(Debug, PartialEq)]
pub enum Error {
  /// An aligned operation failed due to the internal cursor not being byte-aligned
  Unaligned,
  /// An operation failed due to storage not containing enough data
  OutOfBounds,
  /// The requested bit count exceeds the maximum width for the operating type
  InvalidBitCount,
}

impl Display for Error {
  fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
    use Error::*;
    match self {
      OutOfBounds => write!(f, "BitBuf: operation out of bounds"),
      Unaligned => write!(f, "BitBuf: aligned operation on unaligned cursor"),
      InvalidBitCount => write!(f, "BitBuf: requested bit count exceeds type width"),
    }
  }
}

impl core::error::Error for Error {}