sparse-linear-algebra fails to build in nightly with GHC 9.4

[mihaimaruseac]

Preprocessing library for sparse-linear-algebra-0.3.1..
Building library for sparse-linear-algebra-0.3.1..
[ 8 of 21] Compiling Data.Sparse.PPrint

/var/stackage/work/unpack-dir/unpacked/sparse-linear-algebra-0.3.1-65cfbadacf3cd4fdaa89f004cf8cd509e6563e71731fdb164a516f5cd8ddefda/src/Data/Sparse/PPrint.hs:60:29: error:
    • Could not deduce (RealFloat a) arising from a use of ‘f’
      from the context: (PrintfArg a, Epsilon a, Epsilon (Complex a),
                         Ord a)
        bound by the type signature for:
                   printCN :: forall a.
                              (PrintfArg a, Epsilon a, Epsilon (Complex a), Ord a) =>
                              Int -> Int -> PPrintOptions -> [Complex a] -> String
        at src/Data/Sparse/PPrint.hs:(58,1)-(59,57)
      Possible fix:
        add (RealFloat a) to the context of 
          the type signature for:
            printCN :: forall a.
                       (PrintfArg a, Epsilon a, Epsilon (Complex a), Ord a) =>
                       Int -> Int -> PPrintOptions -> [Complex a] -> String
    • In the third argument of ‘printNpad’, namely ‘f’
      In the expression: printNpad l n f
      In an equation for ‘printCN’:
          printCN l n
            = printNpad l n f
            where
                f o x
                  | nearZero (re x) && isNz (imagPart x)
                  = printf (prepD o (imagPart x) ++ "i") (aim x)
                  | nearZero (imagPart x) && isNz (re x)
                  = printf (prepD o (realPart x)) (re x)
                  | isNz x = printf (prepC o x) (re x) (aim x)
                  | otherwise = printf "_"

[andreasabel]

@mihaimaruseac : Great to report, but I do not see a ping to the maintainers here, so how should they learn about it?

I reported this issue there now:

• sparse-linear-algebra 0.3 and 0.3.1 fail to build with GHC 9.4 ocramz/sparse-linear-algebra#79

[alaendle]

Closed this in favor of ocramz/sparse-linear-algebra#79 - so no need to track this also on the stackage issue list. sparse-linear-algebra will semi-automatically be re-enabled once a compatible new version/revision appears on hackage - currently it is disabled by:

        - sparse-linear-algebra < 0 # tried sparse-linear-algebra-0.3.1, but its *library* requires base >=4.7 && < 4.17 and the snapshot contains base-4.18.0.0