haskell - 找不到模块 'Data.Set'

Question

我的 Fedora 28 系统上安装了以下 RPM 软件包:

ghc-ghc-8.2.2-66
ghc-containers-0.5.10.2-66

根据hackage设置的模块应包含在给定的 RPM 中。但是尝试导入 Data.Set 结果

<no location info>: error:
    Could not find module ‘Data.Set’
    Perhaps you meant Data.Int (from base-4.10.1.0)

我是否错过了要安装的东西？如何检查哪些模块可用？

编辑:

$ ghc-pkg list
/usr/lib64/ghc-8.2.2/package.conf.d
    base-4.10.1.0
    ghc-prim-0.5.1.1
    integer-gmp-1.0.1.0
    rts-1.0

如何注册模块？

Answer 1

我会跳过操作系统软件包并选择 stack :

$ wget -o get-stack.sh https://get.haskellstack.org/
$ chmod +x get-stack.sh
$ ./get-stack.sh -d ~/.local/bin
$ echo 'export PATH="~/.local/bin:$PATH"' >> ~/.bashrc
$ source ~/.bashrc
$ stack --version
Version 1.7.1, Git revision ...

然后使用stack ghc运行GHC；第一次会安装这个:

$ stack ghc
Writing implicit global project config file to: ...
Note: You can change the snapshot via the resolver field there.
Using latest snapshot resolver: lts-12.9
Downloaded lts-12.9 build plan.    
Preparing to install GHC to an isolated location.