21 Jul
2009
21 Jul
'09
3:29 p.m.
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