Haskell：Data.Numbers.Primes库在哪里？

Question

我尝试导入Data.Numbers.Primes

import Data.Numbers.Primes

runhaskell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，但我得到了：

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'.

帮助？

Answer 1

您正在寻找的包名为primes。

没有规则将包调用为顶层模块名称。通常情况下，软件包将自己置于任何有意义的东西之下，但这几乎是随意的。如有疑问，Hackage search有帮助。