Resolving dependencies...
Configuring base-orphans-0.5.4...
Configuring data-reify-0.6.1...
Building data-reify-0.6.1...
Building base-orphans-0.5.4...
Installed base-orphans-0.5.4
Configuring erf-2.0.0.0...
Configuring mtl-2.2.1...
Installed data-reify-0.6.1
Building erf-2.0.0.0...
Building mtl-2.2.1...
Configuring nats-1.1.1...
Installed erf-2.0.0.0
Building nats-1.1.1...
Configuring primitive-0.6.1.0...
Installed nats-1.1.1
Building primitive-0.6.1.0...
Configuring prelude-extras-0.4.0.3...
Installed mtl-2.2.1
Building prelude-extras-0.4.0.3...
Configuring semigroups-0.18.2...
Installed primitive-0.6.1.0
Building semigroups-0.18.2...
Configuring stm-2.4.4.1...
Installed prelude-extras-0.4.0.3
Building stm-2.4.4.1...
Configuring reflection-2.1.2...
Installed semigroups-0.18.2
Building reflection-2.1.2...
Configuring transformers-compat-0.5.1.4...
Installed stm-2.4.4.1
Building transformers-compat-0.5.1.4...
Configuring text-1.2.2.1...
Installed transformers-compat-0.5.1.4
Building text-1.2.2.1...
Installed reflection-2.1.2
Configuring vector-0.11.0.0...
Building vector-0.11.0.0...
Configuring StateVar-1.1.0.4...
Installed text-1.2.2.1
Building StateVar-1.1.0.4...
Configuring exceptions-0.8.3...
Installed StateVar-1.1.0.4
Building exceptions-0.8.3...
Configuring tagged-0.8.5...
Installed exceptions-0.8.3
Building tagged-0.8.5...
Configuring hashable-1.2.4.0...
Installed vector-0.11.0.0
Installed tagged-0.8.5
Configuring mwc-random-0.13.4.0...
Building hashable-1.2.4.0...
Building mwc-random-0.13.4.0...
Configuring distributive-0.5.0.2...
Installed hashable-1.2.4.0
Configuring void-0.7.1...
Installed mwc-random-0.13.4.0
Building void-0.7.1...
Building distributive-0.5.0.2...
Installed void-0.7.1
Configuring contravariant-1.4...
Building contravariant-1.4...
Installed distributive-0.5.0.2
Installed contravariant-1.4
Configuring comonad-5...
Building comonad-5...
Installed comonad-5
Configuring bifunctors-5.4.1...
Building bifunctors-5.4.1...
Installed bifunctors-5.4.1
Configuring profunctors-5.2...
Configuring semigroupoids-5.1...
Building profunctors-5.2...
Building semigroupoids-5.1...
Installed profunctors-5.2
Installed semigroupoids-5.1
Configuring free-4.12.4...
Building free-4.12.4...
Installed free-4.12.4
Configuring ad-4.3.2.1...
Building ad-4.3.2.1...
Installed ad-4.3.2.1
Configuring uncertain-0.2.0.0...
Building uncertain-0.2.0.0...
Failed to install uncertain-0.2.0.0
Build log ( /home/builder/.cabal/logs/uncertain-0.2.0.0.log ):
cabal: Entering directory '/tmp/cabal-tmp-32362/uncertain-0.2.0.0'
Configuring uncertain-0.2.0.0...
Building uncertain-0.2.0.0...
Preprocessing library uncertain-0.2.0.0...
[1 of 6] Compiling Data.Hople       ( src/Data/Hople.hs, dist/build/Data/Hople.o )
[2 of 6] Compiling Data.Uncertain   ( src/Data/Uncertain.hs, dist/build/Data/Uncertain.o )

src/Data/Uncertain.hs:214:28: error:
    • No instance for (Floating a) arising from a use of ‘sqrt’
      Possible fix:
        add (Floating a) to the context of
          the type signature of pattern synonym ‘:+/-’
    • In the pattern: sqrt -> dx
      In the pattern: Un x (sqrt -> dx)
      In the declaration for pattern synonym ‘:+/-’
cabal: Leaving directory '/tmp/cabal-tmp-32362/uncertain-0.2.0.0'
cabal: Error: some packages failed to install:
uncertain-0.2.0.0 failed during the building phase. The exception was:
ExitFailure 1