@raehik what error are you seeing?

I wonder if I am running into the same thing, coming via nix build following instructions generated w/ cabal2nix (which presumably uses the hackage release) w/ GHC 9.4.3:

Building library for optics-0.4.2..
[1 of 1] Compiling Optics           ( src/Optics.hs, dist/build/Optics.o, dist/build/Optics.dyn_o )
[1 of 1] Compiling Optics           ( src/Optics.hs, dist/build/Optics.p_o )
Preprocessing test suite 'optics-tests' for optics-0.4.2..
Building test suite 'optics-tests' for optics-0.4.2..
[1 of 9] Compiling Optics.Tests.Properties ( tests/Optics/Tests/Properties.hs, dist/build/optics-tests/optics-tests-tmp/Optics/Tests/Properties.o, dist/build/optics-tests/optics-tests-tmp/Optics/Tests/Properties.dyn_o )
[2 of 9] Compiling Optics.Tests.Utils ( tests/Optics/Tests/Utils.hs, dist/build/optics-tests/optics-tests-tmp/Optics/Tests/Utils.o, dist/build/optics-tests/optics-tests-tmp/Optics/Tests/Utils.dyn_o )
[3 of 9] Compiling Optics.Tests.Misc ( tests/Optics/Tests/Misc.hs, dist/build/optics-tests/optics-tests-tmp/Optics/Tests/Misc.o, dist/build/optics-tests/optics-tests-tmp/Optics/Tests/Misc.dyn_o )
[4 of 9] Compiling Optics.Tests.Labels.TH ( tests/Optics/Tests/Labels/TH.hs, dist/build/optics-tests/optics-tests-tmp/Optics/Tests/Labels/TH.o, dist/build/optics-tests/optics-tests-tmp/Optics/Tests/Labels/TH.dyn_o )
[5 of 9] Compiling Optics.Tests.Labels.Generic ( tests/Optics/Tests/Labels/Generic.hs, dist/build/optics-tests/optics-tests-tmp/Optics/Tests/Labels/Generic.o, dist/build/optics-tests/optics-tests-tmp/Optics/Tests/Labels/Generic.dyn_o )

tests/Optics/Tests/Labels/Generic.hs:72:15: error:
    Ambiguous occurrence ‘name’
    It could refer to
       either the field ‘name’ of record ‘Human’,
              defined at tests/Optics/Tests/Labels/Generic.hs:27:5
           or the field ‘name’ of record ‘Fish’,
              defined at tests/Optics/Tests/Labels/Generic.hs:22:16
           or the field ‘name’ of record ‘Mammal’,
              defined at tests/Optics/Tests/Labels/Generic.hs:17:11
   |
72 | label1rhs s = name (s :: Human a)
   |               ^^^^

tests/Optics/Tests/Labels/Generic.hs:80:15: error:
    Ambiguous occurrence ‘name’
    It could refer to
       either the field ‘name’ of record ‘Human’,
              defined at tests/Optics/Tests/Labels/Generic.hs:27:5
           or the field ‘name’ of record ‘Fish’,
              defined at tests/Optics/Tests/Labels/Generic.hs:22:16
           or the field ‘name’ of record ‘Mammal’,
              defined at tests/Optics/Tests/Labels/Generic.hs:17:11
   |
80 | label3rhs s = name (fish s :: Fish)
   |               ^^^^
[6 of 9] Compiling Optics.Tests.Eta ( tests/Optics/Tests/Eta.hs, dist/build/optics-tests/optics-tests-tmp/Optics/Tests/Eta.o, dist/build/optics-tests/optics-tests-tmp/Optics/Tests/Eta.dyn_o )
[7 of 9] Compiling Optics.Tests.Core ( tests/Optics/Tests/Core.hs, dist/build/optics-tests/optics-tests-tmp/Optics/Tests/Core.o, dist/build/optics-tests/optics-tests-tmp/Optics/Tests/Core.dyn_o )
[8 of 9] Compiling Optics.Tests.Computation ( tests/Optics/Tests/Computation.hs, dist/build/optics-tests/optics-tests-tmp/Optics/Tests/Computation.o, dist/build/optics-tests/optics-tests-tmp/Optics/Tests/Computation.dyn_o )

Tests failing on GHC 9.4 on current Hackage release (0.4.2) #478

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