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Preprocessing test suite 'test' for mfsolve-0.2.0...
[1 of 1] Compiling Main             ( tests/test.hs, dist/build/test/test-tmp/Main.dyn_o )

tests/test.hs:107:8: Not in scope: ‘solveEqs’

Math/MFSolve.hs:103:8:

    Could not find module ‘Control.Monad.Except’

Math/MFSolve.hs:269:41: error:
    Not in scope: type constructor or class ‘ExceptT’
    |
269 |   MFSolverT (StateT (Dependencies v n) (ExceptT (DepError v n) m) a)
    |                                         ^^^^^^^

    where c0 :: Either (DepError SimpleVar Double) Double
          c0 = do d1 <- addEquality noDeps (eqn p1) "c0"
                  d2 <- addEquality d1 (eqn p2)     "c0"
                  soln <- addEquality d2 (eqn p3)   "c0"
                  first (const $ UndefinedVar "c0") $ getKnown "c0" soln

Building test suite 'test' for mfsolve-0.3.2.1..
[1 of 1] Compiling Main             ( tests/test.hs, dist/build/test/test-tmp/Main.o )

tests/test.hs:52:10: error:
    Duplicate instance declarations:
      instance (Floating n, Eq n, Ord n, Ord v) => Eq (Expr v n)
        -- Defined at tests/test.hs:52:10
      instance (Eq n, Eq v) => Eq (Expr v n) -- Defined in ‘Math.MFSolve’
   |
52 | instance (Floating n, Eq n, Ord n, Ord v) => Eq (Expr v n) where
   |          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^