On Thu, Feb 13, 2003 at 03:41:13PM +0100, Wolfgang Thaller wrote:
> The current HEAD is not able to compile the simplest of all Haskell
> programs... but I don't think the bug affects anyone.
> Compiling
>
> > module Main where
> > main = return ()
>
> yields
>
> Main.hs:1:
> Ambiguous type
on (Is it a known bug? If
| not, it should be reported), but returning anything is allowed.
I didn't know about this. This works OK: main = return "foo". So can
you give me an example that fails.
I'll attend to the "simplest program" problem.
Simon
Axel Simon wrote:
This bug is older! ghc 5.04 does not enforce that the return type of
main
is (). In fact with 5.04 you can return anything you want and get very
fancy exception on termination if you return a more complex data type.
I don't know about an exception on termination (Is it a known
The current HEAD is not able to compile the simplest of all Haskell
programs... but I don't think the bug affects anyone.
Compiling
> module Main where
> main = return ()
yields
Main.hs:1:
Ambiguous type variable `m' in these top-level constraint
`Monad m' arising from use of `return'
