Put "Error:" before error output

[Konstantine Rybnikov]

Yitzchak,

Sorry, I didn't get what you mean. Do you mean `error` [0] function from
Prelude? The discussion is currently not regarding runtime program
behavior, nor it is about `error` function. It's rather regarding compiler
output message on compilation failure, so it shouldn't get mixed with your
program's runtime behavior in any way. See ticket #10021 [1] for examples
of what I'm talking about (I'm adding "motivation" section right now).

[0]:
http://hackage.haskell.org/package/base-4.7.0.2/docs/Prelude.html#v:error
[1]: https://ghc.haskell.org/trac/ghc/ticket/10021#modify



On Tue, Jan 27, 2015 at 6:49 PM, Yitzchak Gale <gale at sefer.org> wrote:

> -1
>
> There are common idioms that rely on the current behavior,
> so I think this would break a lot code.
>
> Examples:
>
> In command line programs, it is very common to use
> "error" for printing the usage message.
>
> Many programs use "error" as a general way to exit
> from pure code with a message.
>
> I'm not commenting about whether or not those
> are good practice, just reporting that they are out there.
>
> I would be in favor of this though if it is off by default
> and is turned on by an option or pragma. But not just
> -Werror, though, except for messages that would
> otherwise have been prefixed by "Warning", like
> the current behavior.
>
> Thanks,
> Yitz
>
>
>
> On Fri, Jan 23, 2015 at 1:04 PM, Konstantine Rybnikov <k-bx at k-bx.com>
> wrote:
> > Hi!
> >
> > I'm bringing this up once again. Can we add "Error:" in the output of an
> > error in a similar way ghc shows "Warning:" for warnings? Main reasoning
> is
> > that, for example, on a build-server, where you have lots of cores to
> build
> > your program, if you get an error, it gets lost somewhere in the middle
> of
> > compiler's output in all other "Warning" messages you get, since error is
> > not always shown last on multi-core build.
> >
> > Thanks.
> >
> > _______________________________________________
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> > http://www.haskell.org/mailman/listinfo/ghc-devs
> >
>
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