Bulat Ziganshin wrote:
Hello Neil,
Tuesday, July 21, 2009, 1:26:55 PM, you wrote:
++ [ "-i" | not (null (ghcOptSearchPath opts)) ]
++ [ "-i", dir | dir <- ghcOptSearchPath opts ]
Following the discussions, I now support this extension too - I keep
seeing more and more places in my code where it would be very useful.
++ [ "-i" | not (null (ghcOptSearchPath opts)) ]
++ concat [ ["-i", dir] | dir <- ghcOptSearchPath opts ]
[a | c ] = concat $ do { c; return [a] }
[a,b | c ] = concat $ do { c; return [a,b] }
This would mean that
[ | c ] = concat $ do { c; return [] }
The right is legal Haskell and gives []. The left is (not yet) legal.
Should it be?
Dan
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