Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: gruff (user goal)
rejecting: gruff-0.4, gruff-0.3.4, gruff-0.3.3, gruff-0.3.1, gruff-0.3
(constraint from user target requires ==0.2.1)
trying: gruff-0.2.1
trying: deepseq-1.4.2.0/installed-1.4... (dependency of
bytestring-0.10.8.1/installed-0.1...)
next goal: ruff (dependency of gruff-0.2.1)
rejecting: ruff-0.4.0.1, ruff-0.4, ruff-0.3.2.1, ruff-0.3.2, ruff-0.3
(conflict: gruff => ruff>=0.2 && <0.3)
rejecting: ruff-0.2 (conflict: deepseq => array==0.5.1.1/installed-0.5...,
ruff => array>=0.3 && <0.4)
rejecting: ruff-0.1 (conflict: gruff => ruff>=0.2 && <0.3)
Dependency tree exhaustively searched.