I'm interested if it's possible to use functions from some module without
explicitly importing it. In ghci it's done on the fly, like this:
Prelude> Data.Map.empty
Loading package array-0.3.0.2 ... linking ... done.
Loading package containers-0.4.0.0 ... linking ... done.
fromList []
But without gchi it seems impossible.
I have the file Test.hs:
> {-# LANGUAGE TemplateHaskell #-}
> module Test where
> import Language.Haskell.TH
>
> x :: ExpQ
> x = global $ mkName "Data.Map.empty"
When I load it in ghci, all works:
$ ghci -XTemplateHaskell Test.hs
*Test> $x
Loading package pretty-1.0.1.2 ... linking ... done.
Loading package array-0.3.0.2 ... linking ... done.
Loading package containers-0.4.0.0 ... linking ... done.
Loading package template-haskell ... linking ... done.
fromList []
But when I try to use it from other module, it fails. File Main.hs:
> {-# LANGUAGE TemplateHaskell #-}
> module Main where
> import Test
>
> main = do
> print $x
$ runhaskell Main.hs
Main.hs:5:9:
Not in scope: `Data.Map.empty'
In the result of the splice:
$x
To see what the splice expanded to, use -ddump-splices
In the first argument of `print', namely `$x'
In the expression: print ($x)
--
All the best,
Alexey
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