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(Imported from Trac #817, reported by @jeffwheeler on 2011-03-22)
An if/else block which sets the main-is value for an executable based on a flag is misparsed when running "cabal sdist" (it's parsed correctly when running "cabal install").
Upon failure, it appears that it's looking for a filename that is the two main-is options concatenated together. E.g., I get the error "cabal: HackerMain?.hsMain.hs doesn't exist".
The problematic bit looks like:
My entire config can be found on hpaste: http://hpaste.org/44939/yicabal (problematic lines around 268).
(Imported comment by @dcoutts on 2011-03-22)
Another example http://hpaste.org/48025
Two problems: one is the way sdist uses flatten, and the other is that monoid instance for main-is concatenates rather than picks the last. sdist should not use flatten, it needs to get the collection of values.