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Today's Topics:
1. Re: Network PortNumber deprecation warning (Theodore Lief Gannon)
2. Re: Network PortNumber deprecation warning (Jeff C. Britton)
----------------------------------------------------------------------
Message: 1
Date: Fri, 16 Aug 2019 10:22:57 -0700
From: Theodore Lief Gannon <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] Network PortNumber deprecation
warning
Message-ID:
<cajopsudeb5sojwqk1bs81c+gm3v0isycmfbdvzx_u-5mkmf...@mail.gmail.com>
Content-Type: text/plain; charset="utf-8"
You may have figured this out by now, but according to the docs, the error
is correct: PortNumber exposes no constructor at all. Instead, it has a Num
instance; you should be able to just use the literal 7200 there.
This strikes me as a highly questionable decision on the part of the module
authors, but it is at least convenient.
On Wed, Aug 14, 2019, 10:59 AM Jeff C. Britton <[email protected]> wrote:
> I have just installed Haskell using Stack on Windows.
>
> I wanted to try and write some code to do network programming with TCP/IP.
>
> I found a simple example on Stack Overflow to start me off.
>
> I’m having some problems with PortNumber and deprecated warnings.
>
> I don't know how to modify the code to be deprecation free.
>
>
>
> stack install network – installed version 2.8.0.1
>
>
>
> -------------------------
>
> package.yaml
>
> network >= 2.8.0.1
>
> ---------------------------
>
>
>
> The following code gives a deprecation warning, but ultimately my sample
> compiles and runs.
>
>
>
> import qualified Network
>
> import qualified Network.Socket
>
>
>
> main = Network.withSocketsDo $ do
>
> handle <- Network.connectTo "192.168.1.2" (Network.PortNumber 7200)
>
> talk handle `finally` hClose handle
>
>
>
> D:\work\hsSocket\app\Main.hs:14:46: warning: [-Wdeprecations]
>
> In the use of data constructor `PortNumber'
>
> (imported from Network):
>
> Deprecated: "The high level Network interface is no longer supported.
> Please use Network.Socket."
>
>
>
>
>
> -----------------------------------------
>
> So, now I try and use Network.Socket as the warning indicates.
>
>
>
> main = Network.withSocketsDo $ do
>
> handle <- Network.connectTo "192.168.1.2" (Network.Socket.PortNumber
> 7200)
>
> talk handle `finally` hClose handle
>
>
>
> D:\work\hsSocket\app\Main.hs:15:46: error:
>
> Not in scope: data constructor `Network.Socket.PortNumber'
>
> Module `Network.Socket' does not export `PortNumber'.
>
> |
>
> 15 | handle <- Network.connectTo "192.168.1.2"
> (Network.Socket.PortNumber 7200)
>
>
> _______________________________________________
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Message: 2
Date: Fri, 16 Aug 2019 22:13:38 +0000
From: "Jeff C. Britton" <[email protected]>
To: The Haskell-Beginners Mailing List - Discussion of primarily
beginner-level topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] Network PortNumber deprecation
warning
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<mwhpr17mb103925a2a81c88ad2aaf370fce...@mwhpr17mb1039.namprd17.prod.outlook.com>
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The Network module is deprecated. I didn’t really get that from the warning, I
thought it was just about PortNumber.
From Hackage:
“””
Milestones
2.7
See https://github.com/haskell/network/issues/296
• [x] Making Network deprecated
• [x] Making Network.BSD deprecated
• [x] Making MkSocket deprecated
“””
----
From: Beginners [mailto:[email protected]] On Behalf Of Theodore
Lief Gannon
Sent: Friday, August 16, 2019 10:23 AM
To: The Haskell-Beginners Mailing List - Discussion of primarily beginner-level
topics related to Haskell <[email protected]>
Subject: Re: [Haskell-beginners] Network PortNumber deprecation warning
You may have figured this out by now, but according to the docs, the error is
correct: PortNumber exposes no constructor at all. Instead, it has a Num
instance; you should be able to just use the literal 7200 there.
This strikes me as a highly questionable decision on the part of the module
authors, but it is at least convenient.
On Wed, Aug 14, 2019, 10:59 AM Jeff C. Britton <mailto:[email protected]> wrote:
I have just installed Haskell using Stack on Windows.
I wanted to try and write some code to do network programming with TCP/IP.
I found a simple example on Stack Overflow to start me off.
I’m having some problems with PortNumber and deprecated warnings.
I don't know how to modify the code to be deprecation free.
stack install network – installed version 2.8.0.1
-------------------------
package.yaml
network >= 2.8.0.1
---------------------------
The following code gives a deprecation warning, but ultimately my sample
compiles and runs.
import qualified Network
import qualified Network.Socket
main = Network.withSocketsDo $ do
handle <- Network.connectTo "192.168.1.2" (Network.PortNumber 7200)
talk handle `finally` hClose handle
D:\work\hsSocket\app\Main.hs:14:46: warning: [-Wdeprecations]
In the use of data constructor `PortNumber'
(imported from Network):
Deprecated: "The high level Network interface is no longer supported.
Please use Network.Socket."
-----------------------------------------
So, now I try and use Network.Socket as the warning indicates.
main = Network.withSocketsDo $ do
handle <- Network.connectTo "192.168.1.2" (Network.Socket.PortNumber 7200)
talk handle `finally` hClose handle
D:\work\hsSocket\app\Main.hs:15:46: error:
Not in scope: data constructor `Network.Socket.PortNumber'
Module `Network.Socket' does not export `PortNumber'.
|
15 | handle <- Network.connectTo "192.168.1.2" (Network.Socket.PortNumber
7200)
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