Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: nonlinear-optimization (user goal)
rejecting: nonlinear-optimization-0.3.10, 0.3.9, 0.3.8, 0.3.7, 0.3.6, 0.3.5.2,
0.3.5.1, 0.3.5 (global constraint requires ==0.3.4)
trying: nonlinear-optimization-0.3.4
trying: base-4.8.1.0/installed-4f7... (dependency of
nonlinear-optimization-0.3.4)
next goal: primitive (dependency of nonlinear-optimization-0.3.4)
rejecting: primitive-0.6.1.0, 0.5.4.0, 0.5.3.0, 0.5.2.1, 0.5.1.0, 0.5.0.1,
0.5, 0.4.1, 0.4.0.1, 0.4 (conflict: nonlinear-optimization => primitive>=0.2
&& <0.4)
rejecting: primitive-0.3.1, 0.3 (conflict: base==4.8.1.0/installed-4f7...,
primitive => base>=4 && <4.7)
rejecting: primitive-0.2.1, 0.2 (conflict: base==4.8.1.0/installed-4f7...,
primitive => base>=2 && <4.7)
rejecting: primitive-0.1, 0.6 (conflict: nonlinear-optimization =>
primitive>=0.2 && <0.4)
Dependency tree exhaustively searched.