Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: test-framework-doctest (user goal)
rejecting: test-framework-doctest-0.2.1.2, test-framework-doctest-0.2.1.1,
test-framework-doctest-0.2.1 (constraint from user target requires ==0.2.0.1)
trying: test-framework-doctest-0.2.0.1
trying: base-4.9.0.0/installed-4.9... (dependency of
test-framework-doctest-0.2.0.1)
next goal: doctest (dependency of test-framework-doctest-0.2.0.1)
rejecting: doctest-0.11.0, doctest-0.10.1, doctest-0.10.0, doctest-0.9.13,
doctest-0.9.12, doctest-0.9.11.1, doctest-0.9.11, doctest-0.9.10.2,
doctest-0.9.10.1, doctest-0.9.10, doctest-0.9.9, doctest-0.9.8, doctest-0.9.7,
doctest-0.9.6, doctest-0.9.5.1, doctest-0.9.5, doctest-0.9.4.1, doctest-0.9.4,
doctest-0.9.3, doctest-0.9.2.1, doctest-0.9.2, doctest-0.9.1, doctest-0.9.0,
doctest-0.8.0.1, doctest-0.8.0, doctest-0.7.0, doctest-0.6.1, doctest-0.6.0.1,
doctest-0.6.0 (conflict: test-framework-doctest => doctest>=0.4.0 && <0.6)
rejecting: doctest-0.5.2, doctest-0.5.1 (conflict:
base==4.9.0.0/installed-4.9..., doctest => base>=4.0 && <4.5)
rejecting: doctest-0.5.0, doctest-0.4.2 (conflict:
base==4.9.0.0/installed-4.9..., doctest => base>=4.0 && <4.4)
rejecting: doctest-0.4.1 (conflict: base==4.9.0.0/installed-4.9..., doctest =>
base>=4.0 && <4.5)
rejecting: doctest-0.4.0 (conflict: base==4.9.0.0/installed-4.9..., doctest =>
base>=4.0 && <4.4)
rejecting: doctest-0.3.0 (conflict: test-framework-doctest => doctest>=0.4.0
&& <0.6)
Dependency tree exhaustively searched.