Resolving dependencies...
cabal: Could not resolve dependencies:
[__0] next goal: hledger-iadd (user goal)
[__0] rejecting: hledger-iadd-1.3.14, hledger-iadd-1.3.13,
hledger-iadd-1.3.12, hledger-iadd-1.3.11, hledger-iadd-1.3.10,
hledger-iadd-1.3.9, hledger-iadd-1.3.8, hledger-iadd-1.3.7,
hledger-iadd-1.3.6, hledger-iadd-1.3.5 (constraint from user target requires
==1.3.4)
[__0] trying: hledger-iadd-1.3.4
[__1] trying: transformers-0.5.6.2/installed-0.5.6.2 (dependency of
hledger-iadd)
[__2] next goal: megaparsec (dependency of hledger-iadd)
[__2] rejecting: megaparsec-9.0.1 (conflict: hledger-iadd => megaparsec>=5.0
&& <6.6)
[__2] skipping: megaparsec-9.0.0, megaparsec-8.0.0, megaparsec-7.0.5,
megaparsec-7.0.4, megaparsec-7.0.3, megaparsec-7.0.2, megaparsec-7.0.1,
megaparsec-7.0.0 (has the same characteristics that caused the previous
version to fail: excluded by constraint '>=5.0 && <6.6' from 'hledger-iadd')
[__2] rejecting: megaparsec-6.5.0, megaparsec-6.4.1, megaparsec-6.4.0,
megaparsec-6.3.0, megaparsec-6.2.0, megaparsec-6.1.1, megaparsec-6.1.0,
megaparsec-6.0.2, megaparsec-6.0.1, megaparsec-6.0.0 (conflict: transformers
=> base==4.14.1.0/installed-4.14.1.0, megaparsec => base>=4.7 && <4.13)
[__2] trying: megaparsec-5.3.1
[__3] next goal: exceptions (dependency of megaparsec)
[__3] rejecting: exceptions-0.10.4/installed-0.10.4 (conflict: megaparsec =>
exceptions>=0.6 && <0.9)
[__3] skipping: exceptions-0.10.4, exceptions-0.10.3, exceptions-0.10.2,
exceptions-0.10.1, exceptions-0.10.0 (has the same characteristics that caused
the previous version to fail: excluded by constraint '>=0.6 && <0.9' from
'megaparsec')
[__3] trying: exceptions-0.8.3
[__4] next goal: template-haskell (dependency of exceptions)
[__4] rejecting: template-haskell-2.16.0.0/installed-2.16.0.0 (conflict:
exceptions => template-haskell>=2.2 && <2.14)
[__4] skipping: template-haskell-2.17.0.0, template-haskell-2.16.0.0,
template-haskell-2.15.0.0, template-haskell-2.14.0.0 (has the same
characteristics that caused the previous version to fail: excluded by
constraint '>=2.2 && <2.14' from 'exceptions')
[__4] rejecting: template-haskell-2.13.0.0, template-haskell-2.12.0.0,
template-haskell-2.11.1.0, template-haskell-2.11.0.0,
template-haskell-2.10.0.0, template-haskell-2.9.0.0, template-haskell-2.8.0.0,
template-haskell-2.7.0.0, template-haskell-2.6.0.0, template-haskell-2.5.0.0,
template-haskell-2.4.0.1, template-haskell-2.4.0.0, template-haskell-2.3.0.1,
template-haskell-2.3.0.0, template-haskell-2.2.0.0 (constraint from
non-upgradeable package requires installed instance)
[__4] fail (backjumping, conflict set: exceptions, template-haskell)
After searching the rest of the dependency tree exhaustively, these were the
goals I've had most trouble fulfilling: transformers, exceptions, base,
megaparsec, hledger-iadd, template-haskell, QuickCheck
Try running with --minimize-conflict-set to improve the error message.