cabal 使用 GHC 8.4 安装 djinn-lib？

Question

我正在尝试使用 GHC 8.4.1（来自 Ubuntu 16.04 apt-get）安装 djinn-lib。

$ cabal install djinn-lib

但是我在 <> 运算符中收到歧义错误，如底部所示。

有人知道如何修复它吗？

我使用的 cabal 版本是：

$ cabal --version
cabal-install version 2.2.0.0
compiled using version 2.2.0.0 of the Cabal library

错误信息是：

$ cabal install djinn-lib
Resolving dependencies...
Configuring djinn-lib-0.0.1.2...
Preprocessing library for djinn-lib-0.0.1.2..
Building library for djinn-lib-0.0.1.2..
[1 of 4] Compiling Djinn.LJTFormula ( src/Djinn/LJTFormula.hs, dist/build/Djinn/LJTFormula.o )
[2 of 4] Compiling Djinn.LJT        ( src/Djinn/LJT.hs, dist/build/Djinn/LJT.o )
[3 of 4] Compiling Djinn.HTypes     ( src/Djinn/HTypes.hs, dist/build/Djinn/HTypes.o )

src/Djinn/HTypes.hs:242:29: error:
    Ambiguous occurrence ‘<>’
    It could refer to either ‘Prelude.<>’,
                             imported from ‘Prelude’ at src/Djinn/HTypes.hs:5:8-19
                             (and originally defined in ‘GHC.Base’)
                          or ‘Text.PrettyPrint.HughesPJ.<>’,
                             imported from ‘Text.PrettyPrint.HughesPJ’ at src/Djinn/HTypes.hs:36:67-70
    |
242 | ppPat _ (HPAt s p) = text s <> text "@" <> ppPat 10 p
    |                             ^^

src/Djinn/HTypes.hs:242:41: error:
    Ambiguous occurrence ‘<>’
    It could refer to either ‘Prelude.<>’,
                             imported from ‘Prelude’ at src/Djinn/HTypes.hs:5:8-19
                             (and originally defined in ‘GHC.Base’)
                          or ‘Text.PrettyPrint.HughesPJ.<>’,
                             imported from ‘Text.PrettyPrint.HughesPJ’ at src/Djinn/HTypes.hs:36:67-70
    |
242 | ppPat _ (HPAt s p) = text s <> text "@" <> ppPat 10 p
    |                                         ^^
Failed to install djinn-lib-0.0.1.2
cabal: Error: some packages failed to install:
djinn-lib-0.0.1.2-72XYG7inpNR6A7gk4acAK4 failed during the building phase. The
exception was:
ExitFailure 1

Answer 1

标识符 <> 已添加到序曲中，它与 HughesPJ 中现有的标识符冲突。您可以将行 import Prelude hiding((<>>)) 添加到相关文件的导入部分以解决此问题...

cabal 使用 GHC 8.4 安装 djinn-lib？

cabal install djinn-lib with GHC 8.4?

ghc

cabal