One potential difference between the two is that the current behavior
allows the `Main` module to import `main` from another module, while the
new behavior would fail in that case.
For example, a file that has only a single line:
import SomeOtherModule(main)
This still seems like a fairly unusual corner case (with an obvious work
around), so I don't think it matters much, but I thought I'd mention it so
that we are aware of it.
On Tue, May 16, 2017 at 7:18 AM, Joachim Breitner <[email protected]>
wrote:
> Hi,
>
> a very small proposal to be considered for Haskell':
>
> Currently, the report states
>
> An abbreviated form of module, consisting only of the module body,
> is permitted. If this is used, the header is assumed to be ‘module
> Main(main) where’.
>
> I propose to change that to
>
> An abbreviated form of module, consisting only of the module body,
> is permitted. If this is used, the header is assumed to be ‘module
> Main where’.
>
> The rationale is that a main-less main module is still useful, e.g.
> when you are working a lot in GHCi, and offload a few extensions to a
> separate file. Currently, tools like hdevtools will complain about a
> missing main function when editing such a file.
>
> It would also work better with GHC’s -main-is flag, and avoid problems
> like the one described in https://ghc.haskell.org/trac/ghc/ticket/13704
>
>
> I don’t see any downsides. When compiling to a binary, implementations
> are still able to detect that a Main module is not imported by any
> other module and only the main function is used, and optimize as if
> only main were exported.
>
> Greetings,
> Joachim
>
>
>
> --
> Joachim “nomeata” Breitner
> [email protected] • https://www.joachim-breitner.de/
> XMPP: [email protected] • OpenPGP-Key: 0xF0FBF51F
> Debian Developer: [email protected]
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>
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