Text.Printf replacement?

[Evan Laforge]

> I only see two uses of printf in ghc:
>
> ghc/InteractiveUI.hs:                 let nums  = map (printf
> "-%-3d:") [(1::Int)..]
> compiler/utils/Outputable.lhs:    ppr (Fingerprint w1 w2) = text
> (printf "%016x%016x" w1 w2)
>
> So it seems easy to replace that with some hand-written formatting.

Oh, there are also a bunch of references in libraries/.  But it looks
like mostly tests for bytestring and dph, so still not too bad.