Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: template-haskell (dependency of computational-algebra-0.5.1.0)
rejecting: template-haskell-2.11.1.0/installed-2.1... (conflict:
computational-algebra => template-haskell>=2.12.0.0 && <2.13)
trying: template-haskell-2.12.0.0
next goal: singletons (dependency of computational-algebra-0.5.1.0)
rejecting: singletons-2.3.1, singletons-2.3 (conflict:
base==4.9.1.0/installed-4.9..., singletons => base>=4.10 && <5)
trying: singletons-2.2
next goal: th-desugar (dependency of singletons-2.2)
rejecting: th-desugar-1.7 (conflict: singletons => th-desugar>=1.6 && <1.7)
rejecting: th-desugar-1.6 (conflict: template-haskell==2.12.0.0, th-desugar =>
template-haskell<2.12)
rejecting: th-desugar-1.5.5, th-desugar-1.5.4.1, th-desugar-1.5.4,
th-desugar-1.5.3, th-desugar-1.5.2, th-desugar-1.5.1, th-desugar-1.5,
th-desugar-1.4.2.1, th-desugar-1.4.2, th-desugar-1.4.1, th-desugar-1.4.0,
th-desugar-1.3.1, th-desugar-1.3.0, th-desugar-1.2.1, th-desugar-1.2.0,
th-desugar-1.1.1, th-desugar-1.1.0, th-desugar-1.0.0 (conflict: singletons =>
th-desugar>=1.6 && <1.7)
Dependency tree exhaustively searched.