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hmatrix-tests returns an error upon installation #363

@l8l

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@l8l

Installing hmatrix-tests fails on my machine:

$ stack install hmatrix-tests
hmatrix-tests> configure
hmatrix-tests> Configuring hmatrix-tests-0.19.0.0...
hmatrix-tests> build
hmatrix-tests> Preprocessing library for hmatrix-tests-0.19.0.0..
hmatrix-tests> Building library for hmatrix-tests-0.19.0.0..
hmatrix-tests> [1 of 4] Compiling Numeric.LinearAlgebra.Tests.Instances
hmatrix-tests> [2 of 4] Compiling Numeric.LinearAlgebra.Tests.Properties
hmatrix-tests> [3 of 4] Compiling Numeric.LinearAlgebra.Tests
hmatrix-tests> 
hmatrix-tests> /tmp/stack-31571a6be7ccd2/hmatrix-tests-0.19.0.0/src/Numeric/LinearAlgebra/Tests.hs:410:5: error:
hmatrix-tests>     ‘fail’ is not a (visible) method of class ‘Monad’
hmatrix-tests>     |
hmatrix-tests> 410 |     fail _   = MaybeT $ return Nothing
hmatrix-tests>     |     ^^^^

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