About using "type" to do type alias.

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Origin of Delimited Continuation...

Magicloud Magiclouds

24 Jun 2012 24 Jun '12

10:50 p.m.

Hi, There was another mail, but the subject might be confusing. So I write this one. The code is here: http://hpaste.org/70414 If I understand correct, generally, I could use 'type' to do alias to save the ugly-long code. Like section 1. This works when I 't [(0, Just "x")]'. But, if I wrote section 2. Then 'start (M.fromList $ zip ord_args) worker' could not be compiled due to the second argument is type of 'M.Map Arg Arg', not 'JobArgs Arg Arg'. What did I miss to make this work? -- 竹密岂妨流水过山高哪阻野云飞 And for G+, please use magiclouds#gmail.com.

Show replies by date

Ivan Lazar Miljenovic

25 Jun 25 Jun

2:16 a.m.

On 25 June 2012 12:50, Magicloud Magiclouds wrote:

...

Hi, There was another mail, but the subject might be confusing. So I write this one. The code is here: http://hpaste.org/70414 If I understand correct, generally, I could use 'type' to do alias to save the ugly-long code. Like section 1. This works when I 't [(0, Just "x")]'.

But, if I wrote section 2. Then 'start (M.fromList $ zip ord_args) worker' could not be compiled due to the second argument is type of 'M.Map Arg Arg', not 'JobArgs Arg Arg'.

This shouldn't make a difference. As an example, this works:

...

import qualified Data.Map as M

type Foo a b = M.Map a b

fooInsert :: (Ord a) => a -> b -> Foo a b -> Foo a b fooInsert = M.insert

Aliases are just for documentation; they shouldn't affect code working.

...

What did I miss to make this work? -- 竹密岂妨流水过山高哪阻野云飞

And for G+, please use magiclouds#gmail.com.

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com http://IvanMiljenovic.wordpress.com

Magicloud Magiclouds

3:46 a.m.

Here is the code, I joined two modules in one paste. Both of them cannot pass compiling. http://hpaste.org/70418 On Mon, Jun 25, 2012 at 2:16 PM, Ivan Lazar Miljenovic wrote:

...

On 25 June 2012 12:50, Magicloud Magiclouds wrote:

...
Hi, There was another mail, but the subject might be confusing. So I write this one. The code is here: http://hpaste.org/70414 If I understand correct, generally, I could use 'type' to do alias to save the ugly-long code. Like section 1. This works when I 't [(0, Just "x")]'.

But, if I wrote section 2. Then 'start (M.fromList $ zip ord_args) worker' could not be compiled due to the second argument is type of 'M.Map Arg Arg', not 'JobArgs Arg Arg'.

This shouldn't make a difference. As an example, this works:

...
import qualified Data.Map as M

type Foo a b = M.Map a b

fooInsert :: (Ord a) => a -> b -> Foo a b -> Foo a b fooInsert = M.insert

Aliases are just for documentation; they shouldn't affect code working.

...
What did I miss to make this work? -- 竹密岂妨流水过山高哪阻野云飞

And for G+, please use magiclouds#gmail.com.

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org http://www.haskell.org/mailman/listinfo/haskell-cafe

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com http://IvanMiljenovic.wordpress.com

-- 竹密岂妨流水过山高哪阻野云飞 And for G+, please use magiclouds#gmail.com.

Arlen Cuss

5:04 a.m.

Magicloud, Try to reduce the particular problem you're having to the smallest possible example that reproduces the issue. None of us can compile your code, either, because we're missing many of the dependencies, and unfortunately the issue is no easier (for me) to track down with the full source listing in this case. Cheers, Arlen On Monday, 25 June 2012 at 5:46 PM, Magicloud Magiclouds wrote:

...

Here is the code, I joined two modules in one paste. Both of them cannot pass compiling.

http://hpaste.org/70418

On Mon, Jun 25, 2012 at 2:16 PM, Ivan Lazar Miljenovic wrote:

...
On 25 June 2012 12:50, Magicloud Magiclouds wrote:

...
Hi, There was another mail, but the subject might be confusing. So I write this one. The code is here: http://hpaste.org/70414 If I understand correct, generally, I could use 'type' to do alias to save the ugly-long code. Like section 1. This works when I 't [(0, Just "x")]'.

But, if I wrote section 2. Then 'start (M.fromList $ zip ord_args) worker' could not be compiled due to the second argument is type of 'M.Map Arg Arg', not 'JobArgs Arg Arg'.

This shouldn't make a difference. As an example, this works:

...
import qualified Data.Map as M

type Foo a b = M.Map a b

fooInsert :: (Ord a) => a -> b -> Foo a b -> Foo a b fooInsert = M.insert

Aliases are just for documentation; they shouldn't affect code working.

...
What did I miss to make this work? -- 竹密岂妨流水过山高哪阻野云飞

And for G+, please use magiclouds#gmail.com (http://gmail.com).

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org (mailto:Haskell-Cafe@haskell.org) http://www.haskell.org/mailman/listinfo/haskell-cafe

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com (mailto:Ivan.Miljenovic@gmail.com) http://IvanMiljenovic.wordpress.com

-- 竹密岂妨流水过山高哪阻野云飞

And for G+, please use magiclouds#gmail.com (http://gmail.com).

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org (mailto:Haskell-Cafe@haskell.org) http://www.haskell.org/mailman/listinfo/haskell-cafe

Ivan Lazar Miljenovic

5:11 a.m.

On 25 June 2012 19:04, Arlen Cuss wrote:

...

Magicloud,

Try to reduce the particular problem you're having to the smallest possible example that reproduces the issue. None of us can compile your code, either, because we're missing many of the dependencies, and unfortunately the issue is no easier (for me) to track down with the full source listing in this case.

Though line 22 reveals something: I don't know what Magicloud.Map.mapM is, though I'm guessing it's a lifted version of Data.Map.map. However, I would guess that it's a type problem. Try changing the type of start to be ` start :: (Ord k, Exception e) => JobArgs k a -> (a -> IO b) -> IO (M.Map k (JobInfo a e)) '; I would hazard a guess that you would get the same error, and thus the problem isn't with `type', it's that your mapping function isn't quite correct.

...

Cheers,

Arlen

On Monday, 25 June 2012 at 5:46 PM, Magicloud Magiclouds wrote:

...
Here is the code, I joined two modules in one paste. Both of them cannot pass compiling.

http://hpaste.org/70418

On Mon, Jun 25, 2012 at 2:16 PM, Ivan Lazar Miljenovic wrote:

...
On 25 June 2012 12:50, Magicloud Magiclouds wrote:

...
Hi, There was another mail, but the subject might be confusing. So I write this one. The code is here: http://hpaste.org/70414 If I understand correct, generally, I could use 'type' to do alias to save the ugly-long code. Like section 1. This works when I 't [(0, Just "x")]'.

But, if I wrote section 2. Then 'start (M.fromList $ zip ord_args) worker' could not be compiled due to the second argument is type of 'M.Map Arg Arg', not 'JobArgs Arg Arg'.

This shouldn't make a difference. As an example, this works:

...
import qualified Data.Map as M

type Foo a b = M.Map a b

fooInsert :: (Ord a) => a -> b -> Foo a b -> Foo a b fooInsert = M.insert

Aliases are just for documentation; they shouldn't affect code working.

...
What did I miss to make this work? -- 竹密岂妨流水过山高哪阻野云飞

And for G+, please use magiclouds#gmail.com (http://gmail.com).

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org (mailto:Haskell-Cafe@haskell.org) http://www.haskell.org/mailman/listinfo/haskell-cafe

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com (mailto:Ivan.Miljenovic@gmail.com) http://IvanMiljenovic.wordpress.com

-- 竹密岂妨流水过山高哪阻野云飞

And for G+, please use magiclouds#gmail.com (http://gmail.com).

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org (mailto:Haskell-Cafe@haskell.org) http://www.haskell.org/mailman/listinfo/haskell-cafe

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com http://IvanMiljenovic.wordpress.com

Magicloud Magiclouds

5:19 a.m.

Sorry, I forgot that. Magicloud.Map.mapM sure is a helper I use as lifted Data.Map.map. If I changed the type of the result of start, the Jobs module compiled. But still cannot compile with the other module (which uses start). And the error is on JobArgs. I post the function here, I am not sure how could I fix it. mapM :: (Monad m, Ord k) => (a -> m b) -> M.Map k a -> m (M.Map k b) mapM f m = let (ks, as) = unzip $ M.toList m in Prelude.mapM f as >>= return . M.fromList . zip ks On Mon, Jun 25, 2012 at 5:11 PM, Ivan Lazar Miljenovic wrote:

...

On 25 June 2012 19:04, Arlen Cuss wrote:

...
Magicloud,

Try to reduce the particular problem you're having to the smallest possible example that reproduces the issue. None of us can compile your code, either, because we're missing many of the dependencies, and unfortunately the issue is no easier (for me) to track down with the full source listing in this case.

Though line 22 reveals something: I don't know what Magicloud.Map.mapM is, though I'm guessing it's a lifted version of Data.Map.map. However, I would guess that it's a type problem.

Try changing the type of start to be ` start :: (Ord k, Exception e) => JobArgs k a -> (a -> IO b) -> IO (M.Map k (JobInfo a e)) '; I would hazard a guess that you would get the same error, and thus the problem isn't with `type', it's that your mapping function isn't quite correct.

...
Cheers,

Arlen

On Monday, 25 June 2012 at 5:46 PM, Magicloud Magiclouds wrote:

...
Here is the code, I joined two modules in one paste. Both of them cannot pass compiling.

http://hpaste.org/70418

On Mon, Jun 25, 2012 at 2:16 PM, Ivan Lazar Miljenovic wrote:

...
On 25 June 2012 12:50, Magicloud Magiclouds wrote:

...
Hi, There was another mail, but the subject might be confusing. So I write this one. The code is here: http://hpaste.org/70414 If I understand correct, generally, I could use 'type' to do alias to save the ugly-long code. Like section 1. This works when I 't [(0, Just "x")]'.

But, if I wrote section 2. Then 'start (M.fromList $ zip ord_args) worker' could not be compiled due to the second argument is type of 'M.Map Arg Arg', not 'JobArgs Arg Arg'.

This shouldn't make a difference. As an example, this works:

...
import qualified Data.Map as M

type Foo a b = M.Map a b

fooInsert :: (Ord a) => a -> b -> Foo a b -> Foo a b fooInsert = M.insert

Aliases are just for documentation; they shouldn't affect code working.

...
What did I miss to make this work? -- 竹密岂妨流水过山高哪阻野云飞

And for G+, please use magiclouds#gmail.com (http://gmail.com).

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org (mailto:Haskell-Cafe@haskell.org) http://www.haskell.org/mailman/listinfo/haskell-cafe

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com (mailto:Ivan.Miljenovic@gmail.com) http://IvanMiljenovic.wordpress.com

-- 竹密岂妨流水过山高哪阻野云飞

And for G+, please use magiclouds#gmail.com (http://gmail.com).

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org (mailto:Haskell-Cafe@haskell.org) http://www.haskell.org/mailman/listinfo/haskell-cafe

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com http://IvanMiljenovic.wordpress.com

-- 竹密岂妨流水过山高哪阻野云飞 And for G+, please use magiclouds#gmail.com.

Magicloud Magiclouds

5:53 a.m.

Interesting, seems like mapM did not effect the problem.... Let me try more with the first argument of mapM.... On Mon, Jun 25, 2012 at 5:04 PM, Arlen Cuss wrote:

...

Magicloud,

Try to reduce the particular problem you're having to the smallest possible example that reproduces the issue. None of us can compile your code, either, because we're missing many of the dependencies, and unfortunately the issue is no easier (for me) to track down with the full source listing in this case.

Cheers,

Arlen

On Monday, 25 June 2012 at 5:46 PM, Magicloud Magiclouds wrote:

...
Here is the code, I joined two modules in one paste. Both of them cannot pass compiling.

http://hpaste.org/70418

On Mon, Jun 25, 2012 at 2:16 PM, Ivan Lazar Miljenovic wrote:

...
On 25 June 2012 12:50, Magicloud Magiclouds wrote:

...
Hi, There was another mail, but the subject might be confusing. So I write this one. The code is here: http://hpaste.org/70414 If I understand correct, generally, I could use 'type' to do alias to save the ugly-long code. Like section 1. This works when I 't [(0, Just "x")]'.

But, if I wrote section 2. Then 'start (M.fromList $ zip ord_args) worker' could not be compiled due to the second argument is type of 'M.Map Arg Arg', not 'JobArgs Arg Arg'.

This shouldn't make a difference. As an example, this works:

...
import qualified Data.Map as M

type Foo a b = M.Map a b

fooInsert :: (Ord a) => a -> b -> Foo a b -> Foo a b fooInsert = M.insert

Aliases are just for documentation; they shouldn't affect code working.

...
What did I miss to make this work? -- 竹密岂妨流水过山高哪阻野云飞

And for G+, please use magiclouds#gmail.com (http://gmail.com).

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org (mailto:Haskell-Cafe@haskell.org) http://www.haskell.org/mailman/listinfo/haskell-cafe

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com (mailto:Ivan.Miljenovic@gmail.com) http://IvanMiljenovic.wordpress.com

-- 竹密岂妨流水过山高哪阻野云飞

And for G+, please use magiclouds#gmail.com (http://gmail.com).

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org (mailto:Haskell-Cafe@haskell.org) http://www.haskell.org/mailman/listinfo/haskell-cafe

-- 竹密岂妨流水过山高哪阻野云飞 And for G+, please use magiclouds#gmail.com.

Magicloud Magiclouds

6 a.m.

Even more weird, I installed container-0.5.0.0, and now it just compiled! I will dig more of that. Sorry to bother you guys. On Mon, Jun 25, 2012 at 5:53 PM, Magicloud Magiclouds wrote:

...

Interesting, seems like mapM did not effect the problem.... Let me try more with the first argument of mapM....

On Mon, Jun 25, 2012 at 5:04 PM, Arlen Cuss wrote:

...
Magicloud,

Try to reduce the particular problem you're having to the smallest possible example that reproduces the issue. None of us can compile your code, either, because we're missing many of the dependencies, and unfortunately the issue is no easier (for me) to track down with the full source listing in this case.

Cheers,

Arlen

On Monday, 25 June 2012 at 5:46 PM, Magicloud Magiclouds wrote:

...
Here is the code, I joined two modules in one paste. Both of them cannot pass compiling.

http://hpaste.org/70418

On Mon, Jun 25, 2012 at 2:16 PM, Ivan Lazar Miljenovic wrote:

...
On 25 June 2012 12:50, Magicloud Magiclouds wrote:

...
Hi, There was another mail, but the subject might be confusing. So I write this one. The code is here: http://hpaste.org/70414 If I understand correct, generally, I could use 'type' to do alias to save the ugly-long code. Like section 1. This works when I 't [(0, Just "x")]'.

But, if I wrote section 2. Then 'start (M.fromList $ zip ord_args) worker' could not be compiled due to the second argument is type of 'M.Map Arg Arg', not 'JobArgs Arg Arg'.

This shouldn't make a difference. As an example, this works:

...
import qualified Data.Map as M

type Foo a b = M.Map a b

fooInsert :: (Ord a) => a -> b -> Foo a b -> Foo a b fooInsert = M.insert

Aliases are just for documentation; they shouldn't affect code working.

...
What did I miss to make this work? -- 竹密岂妨流水过山高哪阻野云飞

And for G+, please use magiclouds#gmail.com (http://gmail.com).

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org (mailto:Haskell-Cafe@haskell.org) http://www.haskell.org/mailman/listinfo/haskell-cafe

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com (mailto:Ivan.Miljenovic@gmail.com) http://IvanMiljenovic.wordpress.com

-- 竹密岂妨流水过山高哪阻野云飞

And for G+, please use magiclouds#gmail.com (http://gmail.com).

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org (mailto:Haskell-Cafe@haskell.org) http://www.haskell.org/mailman/listinfo/haskell-cafe

-- 竹密岂妨流水过山高哪阻野云飞

And for G+, please use magiclouds#gmail.com.

-- 竹密岂妨流水过山高哪阻野云飞 And for G+, please use magiclouds#gmail.com.

Arlen Cuss

6:07 a.m.

Glad you worked it out! :) Usually isolating the part of concern in a mysterious error will help shed light on the source! Cheers, Arlen On Monday, 25 June 2012 at 8:00 PM, Magicloud Magiclouds wrote:

...

Even more weird, I installed container-0.5.0.0, and now it just compiled! I will dig more of that. Sorry to bother you guys.

On Mon, Jun 25, 2012 at 5:53 PM, Magicloud Magiclouds wrote:

...
Interesting, seems like mapM did not effect the problem.... Let me try more with the first argument of mapM....

On Mon, Jun 25, 2012 at 5:04 PM, Arlen Cuss wrote:

...
Magicloud,

Try to reduce the particular problem you're having to the smallest possible example that reproduces the issue. None of us can compile your code, either, because we're missing many of the dependencies, and unfortunately the issue is no easier (for me) to track down with the full source listing in this case.

Cheers,

Arlen

On Monday, 25 June 2012 at 5:46 PM, Magicloud Magiclouds wrote:

...
Here is the code, I joined two modules in one paste. Both of them cannot pass compiling.

http://hpaste.org/70418

On Mon, Jun 25, 2012 at 2:16 PM, Ivan Lazar Miljenovic wrote:

...
On 25 June 2012 12:50, Magicloud Magiclouds wrote:

...
Hi, There was another mail, but the subject might be confusing. So I write this one. The code is here: http://hpaste.org/70414 If I understand correct, generally, I could use 'type' to do alias to save the ugly-long code. Like section 1. This works when I 't [(0, Just "x")]'.

But, if I wrote section 2. Then 'start (M.fromList $ zip ord_args) worker' could not be compiled due to the second argument is type of 'M.Map Arg Arg', not 'JobArgs Arg Arg'.

This shouldn't make a difference. As an example, this works:

...
import qualified Data.Map as M

type Foo a b = M.Map a b

fooInsert :: (Ord a) => a -> b -> Foo a b -> Foo a b fooInsert = M.insert

Aliases are just for documentation; they shouldn't affect code working.

...
What did I miss to make this work? -- 竹密岂妨流水过山高哪阻野云飞

And for G+, please use magiclouds#gmail.com (http://gmail.com).

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org (mailto:Haskell-Cafe@haskell.org) http://www.haskell.org/mailman/listinfo/haskell-cafe

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com (mailto:Ivan.Miljenovic@gmail.com) http://IvanMiljenovic.wordpress.com

-- 竹密岂妨流水过山高哪阻野云飞

And for G+, please use magiclouds#gmail.com (http://gmail.com).

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org (mailto:Haskell-Cafe@haskell.org) http://www.haskell.org/mailman/listinfo/haskell-cafe

-- 竹密岂妨流水过山高哪阻野云飞

And for G+, please use magiclouds#gmail.com (http://gmail.com).

-- 竹密岂妨流水过山高哪阻野云飞

And for G+, please use magiclouds#gmail.com (http://gmail.com).

Ivan Lazar Miljenovic

8:12 a.m.

On 25 June 2012 20:00, Magicloud Magiclouds wrote:

...

Even more weird, I installed container-0.5.0.0, and now it just compiled! I will dig more of that. Sorry to bother you guys.

Possibly your Magiclouds module was using a different version of containers or something? *shrug*

...

On Mon, Jun 25, 2012 at 5:53 PM, Magicloud Magiclouds wrote:

...
Interesting, seems like mapM did not effect the problem.... Let me try more with the first argument of mapM....

On Mon, Jun 25, 2012 at 5:04 PM, Arlen Cuss wrote:

...
Magicloud,

Try to reduce the particular problem you're having to the smallest possible example that reproduces the issue. None of us can compile your code, either, because we're missing many of the dependencies, and unfortunately the issue is no easier (for me) to track down with the full source listing in this case.

Cheers,

Arlen

On Monday, 25 June 2012 at 5:46 PM, Magicloud Magiclouds wrote:

...
Here is the code, I joined two modules in one paste. Both of them cannot pass compiling.

http://hpaste.org/70418

On Mon, Jun 25, 2012 at 2:16 PM, Ivan Lazar Miljenovic wrote:

...
On 25 June 2012 12:50, Magicloud Magiclouds wrote:

...
Hi, There was another mail, but the subject might be confusing. So I write this one. The code is here: http://hpaste.org/70414 If I understand correct, generally, I could use 'type' to do alias to save the ugly-long code. Like section 1. This works when I 't [(0, Just "x")]'.

But, if I wrote section 2. Then 'start (M.fromList $ zip ord_args) worker' could not be compiled due to the second argument is type of 'M.Map Arg Arg', not 'JobArgs Arg Arg'.

This shouldn't make a difference. As an example, this works:

...
import qualified Data.Map as M

type Foo a b = M.Map a b

fooInsert :: (Ord a) => a -> b -> Foo a b -> Foo a b fooInsert = M.insert

Aliases are just for documentation; they shouldn't affect code working.

...
What did I miss to make this work? -- 竹密岂妨流水过山高哪阻野云飞

And for G+, please use magiclouds#gmail.com (http://gmail.com).

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org (mailto:Haskell-Cafe@haskell.org) http://www.haskell.org/mailman/listinfo/haskell-cafe

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com (mailto:Ivan.Miljenovic@gmail.com) http://IvanMiljenovic.wordpress.com

-- 竹密岂妨流水过山高哪阻野云飞

And for G+, please use magiclouds#gmail.com (http://gmail.com).

_______________________________________________ Haskell-Cafe mailing list Haskell-Cafe@haskell.org (mailto:Haskell-Cafe@haskell.org) http://www.haskell.org/mailman/listinfo/haskell-cafe

-- 竹密岂妨流水过山高哪阻野云飞

And for G+, please use magiclouds#gmail.com.

-- 竹密岂妨流水过山高哪阻野云飞

And for G+, please use magiclouds#gmail.com.

-- Ivan Lazar Miljenovic Ivan.Miljenovic@gmail.com http://IvanMiljenovic.wordpress.com

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Arlen Cuss
Ivan Lazar Miljenovic
Magicloud Magiclouds