[plt-scheme] Rebuilding Large Files from Small Pieces

Noel Welsh wrote:
> 
> If you leave the files open you'll eventually run out of file handles,
> which will probably crash your program.

For it to actually crash I think something more severe would need to
happen, like using the FFI to close a file handle a port was still
using. Also running out of file handles only breaks your program if you
assume that files have been successfully opened.

On that note,
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