Backport #10483: fix cabal install --program-suffix/prefix
(fix #10290 and #10476)
#10511
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#10290 shows: when checking for existing installations, cabal would not account for an affix (suffix or prefix). So, if you had a
hello
binary installed, installing a second one with a non-empty affix (a perfectly legal operation) would fail.The reason seemed to be a typo in 09c04e9, which passed the arguments to the Symlink structure in a wrong order.
#10476 shows: when failing to install a binary because of an existing one, cabal would report suffix-less existing target even if a suffix was set.
This turned out to be a little issue in pretty printing.
I haven't gotten around to adding tests, sadly.
QA notes
Try to check that both #10290 and #10476 don't reproduce with this patch (they both have clear instructions for reproduction).
Template Α: This PR modifies behaviour or interface
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This is an automatic backport of pull request #10483 done by [Mergify](https://mergify.com).