[image: Inline image 1] "Problem Opening Wizard" I've Eclipse "Version: Neon.2 Release (4.6.2) Build id: 20161208-0600" installed on macOS El Capitan 10.11.6. ​"The selected wizard could not be started. Plug-in net.sf.eclipsefp.haskell.ui was unable to load class net.sf.eclipsefp.haskell.ui.wizards.NewHaskellProjectWizard. An error occurred while automatically activating bundle net.sf.eclipsefp.haskell.ui (482)."​ Albert. Anyone has the same problem and solved it? Thanks. On Thu, Feb 23, 2017 at 1:10 AM, wrote:

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Today's Topics:

1. Re: Type error when using splitOn function. (Francesco Ariis) 2. Re: Type error when using splitOn function. (S. H. Aegis) 3. How to link two Types (PICCA Frederic-Emmanuel) 4. Re: How to link two Types (David McBride) 5. Re: How to link two Types (PICCA Frederic-Emmanuel) 6. Re: How to link two Types (David McBride)

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Message: 1 Date: Wed, 22 Feb 2017 14:31:16 +0100 From: Francesco Ariis To: beginners@haskell.org Subject: Re: [Haskell-beginners] Type error when using splitOn function. Message-ID: <20170222133116.GA14860@casa.casa> Content-Type: text/plain; charset=us-ascii

On Wed, Feb 22, 2017 at 09:02:22PM +0900, S. H. Aegis wrote:

...

Thank you so much.

--makeRxDxList :: Functor f => f Text -> f [Text] Above signature comes from ghci using command :t My intention is makeRxDxList :: Text -> [[Text]] but, I got error, and try several times and below codes pass a complier. makeRxDxList rowRxDx = fmap (\x -> splitOn (pack ",") x) rowRxDx -- This code pass a compile. and then, I run ghci, type :t, and got below signature. makeRxDxList :: Functor f => f Text -> f [Text]

Your kind answer says, I cannot help using fmap. right? ^^; Thanks again.

Then this:

makeRxDxList :: Text -> [[Text]] makeRxDxList rowRxDx = fmap f (lines rowRxDx) -- you imported Prelude hiding map, so we will use fmap where f :: Text -> [Text] f x = splitOn (pack ",") x

should do (at least it typechecks).

GHC errors may not have the prettiest formatting ever, but they are very useful, the most important bits being line & column of the offending expression plus the "expected this but got that" part; get acquainted with them!

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Message: 2 Date: Wed, 22 Feb 2017 22:41:10 +0900 From: "S. H. Aegis" To: The Haskell-Beginners Mailing List - Discussion of primarily beginner-level topics related to Haskell Subject: Re: [Haskell-beginners] Type error when using splitOn function. Message-ID: Content-Type: text/plain; charset="utf-8"

It works !!! (^O^) Thank you so much.

Have a nice day~!

2017-02-22 22:31 GMT+09:00 Francesco Ariis :

...

On Wed, Feb 22, 2017 at 09:02:22PM +0900, S. H. Aegis wrote:

...

Thank you so much.

--makeRxDxList :: Functor f => f Text -> f [Text] Above signature comes from ghci using command :t My intention is makeRxDxList :: Text -> [[Text]] but, I got error, and try several times and below codes pass a complier. makeRxDxList rowRxDx = fmap (\x -> splitOn (pack ",") x) rowRxDx -- This code pass a compile. and then, I run ghci, type :t, and got below signature. makeRxDxList :: Functor f => f Text -> f [Text]

Your kind answer says, I cannot help using fmap. right? ^^; Thanks again.

Then this:

makeRxDxList :: Text -> [[Text]] makeRxDxList rowRxDx = fmap f (lines rowRxDx) -- you imported Prelude hiding map, so we will use fmap where f :: Text -> [Text] f x = splitOn (pack ",") x

should do (at least it typechecks).

GHC errors may not have the prettiest formatting ever, but they are very useful, the most important bits being line & column of the offending expression plus the "expected this but got that" part; get acquainted with them!

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