Re: [Haskell-cafe] Selda, type operators and heterogeneous lists

14 Apr 2018


      On Fri, Apr 13, 2018 at 04:38:46PM +0200, Marc Busqué wrote:
...
On Fri, 13 Apr 2018, Tom Ellis wrote:
...
On Fri, Apr 13, 2018 at 03:59:44PM +0200, Marc Busqué wrote:
Before we can help we need to know more.  Specifically, why do you want to
put them in a single list?
I want to make the same action with more than one (creating them in
the database server):
```
migrate :: IO ()
migrate = do
    dir <- dBDir
    createDirectoryIfMissing True dir
    forM_ [categories, expenses]
       $ withDB . createTable ```
I think I would just tolerate

      forM_ [createTable categories, createTable expenses]
        $ withDB