[Haskell-cafe] ghc -e

[Gwern Branwen]

On Wed, Jan 6, 2010 at 7:23 PM, Tony Morris <tonymorris at gmail.com> 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)

-- 
gwern