[Haskell-cafe] -fdefer-more-errors

Dan Burton danburton.email at gmail.com
Thu May 28 09:38:37 UTC 2015

Wow, I just posted to reddit asking about the same thing. Should have
checked my email first. :)


Obviously, I concur that this would make Haskell more pleasant for me. I
just used -fdefer-type-errors today, which turned out to be a huge
convenience, and I would have similarly benefited from -fdefer-name-errors.

-- Dan Burton

On Thu, May 28, 2015 at 1:26 AM, Tom Ellis <
tom-lists-haskell-cafe-2013 at jaguarpaw.co.uk> wrote:

> Deferring type errors until runtime is a feature which probably helps a lot
> with the adoption of Haskell.  Newcomers can get the encouragement of a
> mostly-working program even if there are type errors in a few places.
> I can write
>     foo = 1 + 1
>     bar = head True
>     main = print foo
> and still run the program or load it in GHCi.
> Does anyone think it would also be beneficial to have
> "-fdefer-name-errors"?
> If I write
>     foo = 1 + 1
>     bar = baz
>     main = print foo
> but baz doesn't exist it would still be nice to let the program run or be
> loaded in GHCi.  This could be achieved by replacing all missing variables
> by "error 'baz was not defined'" or similar.
> If a suitable parser could be written it might even be possible to defer
> syntax errors!
> This kind of thing would make the experience with Haskell gentler for
> newcomers, but also more pleasant for veterans!
> Tom
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