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Posted to dev@thrift.apache.org by "Jens Geyer (JIRA)" <ji...@apache.org> on 2015/04/26 18:09:38 UTC

[jira] [Closed] (THRIFT-3116) Ambiguous exports in Haskell-generated code

     [ https://issues.apache.org/jira/browse/THRIFT-3116?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jens Geyer closed THRIFT-3116.
------------------------------

> Ambiguous exports in Haskell-generated code
> -------------------------------------------
>
>                 Key: THRIFT-3116
>                 URL: https://issues.apache.org/jira/browse/THRIFT-3116
>             Project: Thrift
>          Issue Type: Bug
>          Components: Haskell - Compiler
>    Affects Versions: 0.9.1
>         Environment: Ubuntu 14.04
>            Reporter: Andreas Voellmy
>             Fix For: 0.9.2
>
>
> It looks like the Thrift-generated Haskell exports functions in a way that causes problems. For example, when I use thrift on the tutorial example, and then I start up ghci and do 
> Prelude> :l Calculator_Client.hs 
> [1 of 8] Compiling Shared_Types     ( Shared_Types.hs, interpreted )
> [2 of 8] Compiling Tutorial_Types   ( Tutorial_Types.hs, interpreted )
> [3 of 8] Compiling SharedService_Iface ( SharedService_Iface.hs, interpreted )
> [4 of 8] Compiling SharedService    ( SharedService.hs, interpreted )
> [5 of 8] Compiling Calculator_Iface ( Calculator_Iface.hs, interpreted )
> [6 of 8] Compiling Calculator       ( Calculator.hs, interpreted )
> [7 of 8] Compiling SharedService_Client ( SharedService_Client.hs, interpreted )
> [8 of 8] Compiling Calculator_Client ( Calculator_Client.hs, interpreted )
> Calculator_Client.hs:15:45:
>     Ambiguous occurrence ‘zip’
>     It could refer to either ‘Calculator_Client.zip’,
>                              defined at Calculator_Client.hs:112:1
>                           or ‘Data.ByteString.Lazy.zip’,
>                              imported from ‘Data.ByteString.Lazy’ at Calculator_Client.hs:24:1-27
> Failed, modules loaded: SharedService_Client, Shared_Types, Tutorial_Types, Calculator, SharedService, Calculator_Iface, SharedService_Iface.
> The problem is that zip (from the service definition) is also exported by Data.ByteString.Lazy. One solution to this is to import all modules using qualified imports.



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