我尝试导入 Data.Numbers.Primes
import Data.Numbers.Primes
伦哈斯克尔给了我：
5.hs:1:8:
Could not find module `Data.Numbers.Primes'
Use -v to see a list of the files searched for.
ghci 给了我：
<no location info>:
Could not find module `Data.Numbers.Primes'
It is not a module in the current program, or in any known package.
我尝试通过 cabal 安装 Data.Numbers.Primes，但我得到：
cabal update
...
cabal install Data
cabal: There is no package named 'Data'.
You may need to run 'cabal update' to get the latest list of available
packages.
cabal install Data.Numbers.Primes
cabal: The file does not exist 'Data.Numbers.Primes'.
help?
您正在寻找的包名为primes https://hackage.haskell.org/package/primes.
没有规定包的名称与其顶级模块名称相同。通常，包将自己置于任何有意义的位置，但这几乎是任意的。有疑问时，黑客搜索 https://hackage.haskell.org/packages/search?terms=Primes helps.
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