Resolving dependencies...
cabal: Could not resolve dependencies:
trying: ecma262-0.0.0 (user goal)
trying: base-4.8.1.0/installed-4f7... (dependency of ecma262-0.0.0)
next goal: lens (dependency of ecma262-0.0.0)
rejecting: lens-4.13, 4.12.3, 4.12.2, 4.12.1, 4.12, 4.11.1, 4.11, 4.10, 4.9.1,
4.9, 4.8, 4.7.0.1, 4.7 (conflict: ecma262 => lens==4.6.*)
rejecting: lens-4.6.0.1, 4.6 (conflict: base==4.8.1.0/installed-4f7..., lens
=> base>=4.4 && <4.8)
rejecting: lens-4.5, 4.4.0.2, 4.4.0.1, 4.4, 4.3.3, 4.3.2, 4.3.1, 4.3, 4.2,
4.1.2.1, 4.1.2, 4.1.1, 4.1, 4.0.7, 4.0.6, 4.0.5, 4.0.4, 4.0.3, 4.0.2, 4.0.1,
4.0, 3.10.3, 3.10.2, 3.10.1, 3.10.0.1, 3.10, 3.9.2, 3.9.1, 3.9.0.3, 3.9.0.2,
3.9.0.1, 3.9, 3.8.7.3, 3.8.7.2, 3.8.7.1, 3.8.7, 3.8.6, 3.8.5, 3.8.4, 3.8.3,
3.8.2, 3.8.1, 3.8.0.2, 3.8.0.1, 3.8, 3.7.6, 3.7.5, 3.7.4, 3.7.3, 3.7.2,
3.7.1.2, 3.7.1.1, 3.7.1, 3.7.0.2, 3.7.0.1, 3.7, 3.6.0.4, 3.6.0.3, 3.6.0.2,
3.6.0.1, 3.6, 3.5.1, 3.5, 3.4, 3.3, 3.2, 3.1, 3.0.6, 3.0.5, 3.0.4, 3.0.3,
3.0.2, 3.0.1, 3.0, 2.9, 2.8, 2.7.0.1, 2.7, 2.6.1, 2.6, 2.5, 2.4.0.2, 2.4, 2.3,
2.2, 2.1, 2.0, 1.9.1, 1.9, 1.8, 1.7.1, 1.7, 1.6, 1.5, 1.4.1, 1.4, 1.3.1, 1.3,
1.2, 1.1.1, 1.1, 1.0.3, 1.0.2, 1.0.1, 1.0, 0.9, 0.8, 0.7, 0.6, 0.5, 0.4, 0.3,
0.2, 0.1 (conflict: ecma262 => lens==4.6.*)
Dependency tree exhaustively searched.