Resolving dependencies...
cabal: Could not resolve dependencies:
next goal: protocol-buffers-descriptor (user goal)
rejecting: protocol-buffers-descriptor-2.4.0 (constraint from user target
requires ==2.3.1)
trying: protocol-buffers-descriptor-2.3.1
trying: base-4.9.0.0/installed-4.9... (dependency of
protocol-buffers-descriptor-2.3.1)
next goal: protocol-buffers (dependency of protocol-buffers-descriptor-2.3.1)
rejecting: protocol-buffers-2.4.0 (conflict: protocol-buffers-descriptor =>
protocol-buffers==2.3.1)
rejecting: protocol-buffers-2.3.1 (conflict: base==4.9.0.0/installed-4.9...,
protocol-buffers => base>=4.7.0 && <4.9)
rejecting: protocol-buffers-2.3.0, protocol-buffers-2.2.0,
protocol-buffers-2.1.12, protocol-buffers-2.1.11, protocol-buffers-2.1.10,
protocol-buffers-2.1.9, protocol-buffers-2.1.8, protocol-buffers-2.1.7,
protocol-buffers-2.1.6, protocol-buffers-2.1.5, protocol-buffers-2.1.4,
protocol-buffers-2.1.3, protocol-buffers-2.1.2, protocol-buffers-2.1.1,
protocol-buffers-2.1.0, protocol-buffers-2.0.17, protocol-buffers-2.0.14,
protocol-buffers-2.0.12, protocol-buffers-2.0.11, protocol-buffers-2.0.10,
protocol-buffers-2.0.9, protocol-buffers-2.0.8, protocol-buffers-2.0.7,
protocol-buffers-2.0.6, protocol-buffers-2.0.5, protocol-buffers-2.0.2,
protocol-buffers-2.0.0, protocol-buffers-1.8.3, protocol-buffers-1.8.2,
protocol-buffers-1.8.0, protocol-buffers-1.7.9, protocol-buffers-1.6.0,
protocol-buffers-1.5.0, protocol-buffers-1.4.0, protocol-buffers-1.2.2,
protocol-buffers-1.2.1, protocol-buffers-1.0.1, protocol-buffers-1.0.0,
protocol-buffers-0.3.1, protocol-buffers-0.2.9, protocol-buffers-0.2.8,
protocol-buffers-0.1.0, protocol-buffers-0.0.5, protocol-buffers-0.0.2,
protocol-buffers-0.0.1 (conflict: protocol-buffers-descriptor =>
protocol-buffers==2.3.1)
Dependency tree exhaustively searched.