In local.libraries, you wrote:

...

hPutPS (at least as packaged in ghc 5.04.2--I haven't yet tried with 5.04.3) fails when given an empty string with the error:

Action: hPutArray Handle: {loc=<stdout>,type=writable,binary=False,buffering=none} Reason: illegal buffer size 0

I guess maybe this is actually a bug in hPutArray (which I know nothing about), but I'm sure that one should be able to output an empty string.

hPutArray with count = 0 probably shouldn't fail, I'll check this. If generating an empty array in hPutPS is a bug I cannot tell.

I just fixed this. Cheers, Simon