[PATCH] Drop memoization of envvars used by create-temporary-{file,directory}

[Mario Domenech Goulart]

Hi,

Attached is a patch to fix an issue (#1830) affecting
create-temporary-{file,directory} in cases where the environment
variables they use to determine the directory where temporary
files/directories are created get changed.

Please see the commit message and https://bugs.call-cc.org/ticket/1830
for more details.

The patch also contains some updates to the documentation and a couple
of simple tests.  The tests will be called by "make check" on Windows,
but I haven't run them there as I don't have a Windows system.

All the best.
Mario
-- 
http://parenteses.org/mario

0001-Drop-memoization-of-envvars-used-by-create-temporary.patch
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