
Gwern Branwen wrote:
On Wed, Jan 6, 2010 at 7:23 PM, Tony Morris
wrote: ghc -e "import Control.Monad; forM [[1,2,3]] reverse"
As of 6.10.2, the bug whereby the GHC API lets you use functions from anywhere just by naming them (Java-style) has not been fixed:
$ ghc -e "Control.Monad.forM [[1,2,3]] reverse" package flags have changed, resetting and loading new packages...
<interactive>:1:25: Warning: Defaulting the following constraint(s) to type `Integer' `Num t' arising from the literal `3' at <interactive>:1:25 In the expression: 3 In the expression: [1, 2, 3] In the first argument of `forM', namely `[[1, 2, 3]]'
<interactive>:1:25: Warning: Defaulting the following constraint(s) to type `Integer' `Num t' arising from the literal `3' at <interactive>:1:25 In the expression: 3 In the expression: [1, 2, 3] In the first argument of `forM', namely `[[1, 2, 3]]' [[3],[2],[1]] it :: [[Integer]] (0.01 secs, 1710984 bytes)
I see the same on GHC 6.10.4. $ ghc -e "Control.Monad.forM [[1,2,3]] reverse" [[3],[2],[1]] What would it be fixed to? What is wrong with how it is? -- Tony Morris http://tmorris.net/