int-cast-0.1.2.0 does not compile with GHC 8.4.1

[peti]

Configuring int-cast-0.1.2.0...
Dependency QuickCheck -any: using QuickCheck-2.10.1
Dependency base -any: using base-4.11.0.0
Dependency int-cast -any: using int-cast-0.1.2.0
Dependency test-framework -any: using test-framework-0.8.2.0
Dependency test-framework-quickcheck2 -any: using
test-framework-quickcheck2-0.3.0.4
Source component graph:
    component lib
    component test:int-cast-test dependency lib
Configured component graph:
    component int-cast-0.1.2.0-4tBxsukrjhQ5yZHRPorxnT
        include base-4.11.0.0
    component int-cast-0.1.2.0-KqcZLQ3ktk11cDA35E6Pd3-int-cast-test
        include int-cast-0.1.2.0-4tBxsukrjhQ5yZHRPorxnT
        include base-4.11.0.0
        include QuickCheck-2.10.1-CbgtHLlDxiaFiLP2gWIbBW
        include test-framework-0.8.2.0-F7UQfdPYM1oGur1jtp73lc
        include test-framework-quickcheck2-0.3.0.4-9ohw4xBY2VZ51JanR5ESUg
Linked component graph:
    unit int-cast-0.1.2.0-4tBxsukrjhQ5yZHRPorxnT
        include base-4.11.0.0
        Data.IntCast=int-cast-0.1.2.0-4tBxsukrjhQ5yZHRPorxnT:Data.IntCast
    unit int-cast-0.1.2.0-KqcZLQ3ktk11cDA35E6Pd3-int-cast-test
        include int-cast-0.1.2.0-4tBxsukrjhQ5yZHRPorxnT
        include base-4.11.0.0
        include QuickCheck-2.10.1-CbgtHLlDxiaFiLP2gWIbBW
        include test-framework-0.8.2.0-F7UQfdPYM1oGur1jtp73lc
        include test-framework-quickcheck2-0.3.0.4-9ohw4xBY2VZ51JanR5ESUg
Ready component graph:
    definite int-cast-0.1.2.0-4tBxsukrjhQ5yZHRPorxnT
        depends base-4.11.0.0
    definite int-cast-0.1.2.0-KqcZLQ3ktk11cDA35E6Pd3-int-cast-test
        depends int-cast-0.1.2.0-4tBxsukrjhQ5yZHRPorxnT
        depends base-4.11.0.0
        depends QuickCheck-2.10.1-CbgtHLlDxiaFiLP2gWIbBW
        depends test-framework-0.8.2.0-F7UQfdPYM1oGur1jtp73lc
        depends test-framework-quickcheck2-0.3.0.4-9ohw4xBY2VZ51JanR5ESUg
Using Cabal-2.2.0.0 compiled by ghc-8.4
Using compiler: ghc-8.4.1
Using install prefix:
/nix/store/5735w8qy34yyiyi6s8sbpigz189wv05n-int-cast-0.1.2.0
Executables installed in:
/nix/store/5735w8qy34yyiyi6s8sbpigz189wv05n-int-cast-0.1.2.0/bin
Libraries installed in:
/nix/store/5735w8qy34yyiyi6s8sbpigz189wv05n-int-cast-0.1.2.0/lib/ghc-8.4.1/int-cast-0.1.2.0
Dynamic Libraries installed in:
/nix/store/5735w8qy34yyiyi6s8sbpigz189wv05n-int-cast-0.1.2.0/lib/ghc-8.4.1/x86_64-linux-ghc-8.4.1
Private executables installed in:
/nix/store/5735w8qy34yyiyi6s8sbpigz189wv05n-int-cast-0.1.2.0/libexec/x86_64-linux-ghc-8.4.1/int-cast-0.1.2.0
Data files installed in:
/nix/store/5735w8qy34yyiyi6s8sbpigz189wv05n-int-cast-0.1.2.0/share/x86_64-linux-ghc-8.4.1/int-cast-0.1.2.0
Documentation installed in:
/nix/store/lq0vw3i9n2lbahiq5bvgx60wanbbs4vd-int-cast-0.1.2.0-doc/share/doc
Configuration files installed in:
/nix/store/5735w8qy34yyiyi6s8sbpigz189wv05n-int-cast-0.1.2.0/etc
No alex found
Using ar found on system at:
/nix/store/fzcs0fn6bb04m82frhlb78nc03ny3w55-binutils-2.28.1/bin/ar
No c2hs found
No cpphs found
No doctest found
Using gcc version 7.3.0 given by user at:
/nix/store/4r5kszyy0iirc5agfah45lvz7mnnsrb4-gcc-wrapper-7.3.0/bin/gcc
Using ghc version 8.4.1 found on system at:
/nix/store/8cdbwmwrlx4hxnpvil2ddmnk7y2bki4s-ghc-8.4.1/bin/ghc
Using ghc-pkg version 8.4.1 found on system at:
/nix/store/8cdbwmwrlx4hxnpvil2ddmnk7y2bki4s-ghc-8.4.1/bin/ghc-pkg
No ghcjs found
No ghcjs-pkg found
No greencard found
Using haddock version 2.19.0 found on system at:
/nix/store/8cdbwmwrlx4hxnpvil2ddmnk7y2bki4s-ghc-8.4.1/bin/haddock
No happy found
Using haskell-suite found on system at: haskell-suite-dummy-location
Using haskell-suite-pkg found on system at: haskell-suite-pkg-dummy-location
No hmake found
Using hpc version 0.67 found on system at:
/nix/store/8cdbwmwrlx4hxnpvil2ddmnk7y2bki4s-ghc-8.4.1/bin/hpc
Using hsc2hs version 0.68.3 found on system at:
/nix/store/8cdbwmwrlx4hxnpvil2ddmnk7y2bki4s-ghc-8.4.1/bin/hsc2hs
Using hscolour version 1.24 found on system at:
/nix/store/p6qm3s4h4nx2x7f5ghbpih28gs6cr87m-hscolour-1.24.4/bin/HsColour
No jhc found
Using ld found on system at:
/nix/store/1is4c0vfcs0q5i3ygij21y6z713lihw9-binutils-wrapper-2.28.1/bin/ld
No lhc found
No lhc-pkg found
No pkg-config found
Using runghc version 8.4.1 found on system at:
/nix/store/8cdbwmwrlx4hxnpvil2ddmnk7y2bki4s-ghc-8.4.1/bin/runghc
Using strip version 2.28 found on system at:
/nix/store/fzcs0fn6bb04m82frhlb78nc03ny3w55-binutils-2.28.1/bin/strip
Using tar found on system at:
/nix/store/rng0r3whml1jql1s6ps11v7f8cxmna04-gnutar-1.30/bin/tar
No uhc found
building
Preprocessing library for int-cast-0.1.2.0..
Building library for int-cast-0.1.2.0..
[1 of 1] Compiling Data.IntCast     ( Data/IntCast.hs, dist/build/Data/IntCast.o )

Data/IntCast.hs:184:1: error:
    • Illegal instance for closed family ‘==’
    • In the type instance declaration for ‘==’
    |
184 | type instance a == b = IsIntBaseTypeEq a b
    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

[hvr]

Well, yeah... that's why I didn't relax the upper bound in int-cast-0.1.2.0... but I didn't yet have time to look into this

[hvr]

This has been resolved as per http://hackage.haskell.org/package/int-cast-0.2.0.0