xsv might silently fail

[lukaslueg]

xsv/src/cmd/index.rs

Lines 55 to 58 in 4278b85

	let mut wtr = io::BufWriter::new(fs::File::create(&pidx)?);
	RandomAccessSimple::create(&mut rdr, &mut wtr)?;
	Ok(())
	}

Notice that there is a bug here: If the output is small enough to delay flushing the BufWriter until the (implicit) drop at the end of the scope, the BufWriter might fail for whatever reason to write to the underlying, yet its destructor will silently discard the error.