[Haskell-beginners] How to use Text.Printf w/ custom types

[Norbert Melzer]

According to
https://hackage.haskell.org/package/base-4.10.0.0/docs/Text-Printf.html#g:2,
you only need to implement `PrintfArg`. There is also an example for `()`.

Baa <aquagnu at gmail.com> schrieb am Fr., 24. Nov. 2017 um 13:33 Uhr:

> Hello All!
>
> As I understand to use Text.Printf.printf with custom types or to
> return result as Text instead of String I must implement some
> class instances: PrintfType, PrintfArg. But how to do this if they are
> exported from module as type-names only - without its methods (i.e. not
> "Printf (..)", but "Printf") ?
>
> I tried to import Text.Printf.Internal but seems that no such
> submodule...
>
> Any ideas?
>
> ===
> Best regards, Paul
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