message: mockchain: prettify the FromStr impl for BlockDate
diff: @@ -146,8 +146,8 @@ impl str::FromStr for BlockDate {
  None => return Err(BlockDateParseError::DotMissing),
  Some(pos) => s.split_at(pos),
  };
  - let epoch = str::parse::<u64>(ep).map_err(|e| BlockDateParseError::BadEpochId(e))?;
  - let slot_id = str::parse::<u64>(sp).map_err(|e| BlockDateParseError::BadSlotId(e))?;
  + let epoch = str::parse::<u64>(ep).map_err(BlockDateParseError::BadEpochId)?;
  + let slot_id = str::parse::<u64>(sp).map_err(BlockDateParseError::BadSlotId)?;
  Ok(BlockDate { epoch, slot_id })
  }
  }
  