[Chicken-hackers] [PATCH] Fix #1109 by removing directory when an error occurs during chicken-install -r

[Peter Bex]

Hi all,

Here's a pretty simple patch for #1109.  This simply catches any
exceptions that occur during retrieval of http locations (it already
handles svn and local files differently: there it checks first whether
the source exists before creating the target dir), and then removes
the directory if it didn't exist initially.

As is our rule, I removed the square parens so the patch is a little
bigger than it strictly speaking has to be.  I also rewrote the let and
let-values stuff to a simpler receive/let* combination.

Cheers,
Peter
-- 
http://www.more-magic.net

0001-Fix-1109-chicken-install-r-should-remove-empty-direc.patch
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