Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: bytestring-tree-builder (user goal)
rejecting: bytestring-tree-builder-0.2.7.1, bytestring-tree-builder-0.2.7,
bytestring-tree-builder-0.2.6, bytestring-tree-builder-0.2.5,
bytestring-tree-builder-0.2.4, bytestring-tree-builder-0.2.3.1,
bytestring-tree-builder-0.2.3, bytestring-tree-builder-0.2.2.1,
bytestring-tree-builder-0.2.2, bytestring-tree-builder-0.2.1.4,
bytestring-tree-builder-0.2.1.3, bytestring-tree-builder-0.2.1.2 (constraint
from user target requires ==0.2.1.1)
trying: bytestring-tree-builder-0.2.1.1
trying: base-4.9.0.0/installed-4.9... (dependency of
bytestring-tree-builder-0.2.1.1)
next goal: base-prelude (dependency of bytestring-tree-builder-0.2.1.1)
rejecting: base-prelude-1.0.1.1, base-prelude-1.0.1, base-prelude-1,
base-prelude-0.2 (conflict: bytestring-tree-builder => base-prelude>=0.1.19 &&
<0.2)
rejecting: base-prelude-0.1.21, base-prelude-0.1.20, base-prelude-0.1.19
(conflict: base==4.9.0.0/installed-4.9..., base-prelude => base>=4.6 && <4.9)
rejecting: base-prelude-0.1.17, base-prelude-0.1.16, base-prelude-0.1.15,
base-prelude-0.1.14, base-prelude-0.1.13, base-prelude-0.1.12,
base-prelude-0.1.11, base-prelude-0.1.10, base-prelude-0.1.9,
base-prelude-0.1.8, base-prelude-0.1.7, base-prelude-0.1.6,
base-prelude-0.1.5, base-prelude-0.1.4, base-prelude-0.1.3,
base-prelude-0.1.2, base-prelude-0.1.1, base-prelude-0.1.0,
base-prelude-0.1.18 (conflict: bytestring-tree-builder => base-prelude>=0.1.19
&& <0.2)
Dependency tree exhaustively searched.