paste

Using the following cabal packages:
- lens.cabal
- examples/lens-examples.cabal
- lens-properties/lens-properties.cabal

Selecting the best among 6 snapshots...

* Partially matches lts-3.19
    gloss not found
    - lens-examples requires ==1.7.*

    mtl version 2.2.1 found
    - lens-examples requires >=2.0.1 && <2.2

    random version 1.1 found
    - lens-examples requires ==1.0.*

    reflection version 2 found
    - lens requires >=2.1 && <3

* Partially matches lts-3.16
    gloss not found
    - lens-examples requires ==1.7.*

    mtl version 2.2.1 found
    - lens-examples requires >=2.0.1 && <2.2

    random version 1.1 found
    - lens-examples requires ==1.0.*

    reflection version 2 found
    - lens requires >=2.1 && <3

* Partially matches nightly-2015-12-30
    gloss not found
    - lens-examples requires ==1.7.*

    mtl version 2.2.1 found
    - lens-examples requires >=2.0.1 && <2.2

    random version 1.1 found
    - lens-examples requires ==1.0.*

* Partially matches lts-3.20
    gloss not found
    - lens-examples requires ==1.7.*

    mtl version 2.2.1 found
    - lens-examples requires >=2.0.1 && <2.2

    random version 1.1 found
    - lens-examples requires ==1.0.*

    reflection version 2 found
    - lens requires >=2.1 && <3

* Partially matches lts-2.22
    base-orphans not found
    - lens requires >=0.3 && <1

    bifunctors version 4.2.1 found
    - lens requires >=5 && <6

    gloss not found
    - lens-examples requires ==1.7.*

    profunctors version 4.4.1 found
    - lens requires >=5 && <6

    random version 1.1 found
    - lens-examples requires ==1.0.*

    reflection version 1.5.2.1 found
    - lens requires >=2.1 && <3

    semigroupoids version 4.3 found
    - lens requires >=5 && <6

* Partially matches nightly-2016-01-02
    gloss not found
    - lens-examples requires ==1.7.*

    mtl version 2.2.1 found
    - lens-examples requires >=2.0.1 && <2.2

    random version 1.1 found
    - lens-examples requires ==1.0.*

Selected snapshot 'nightly-2015-12-30'.
Solver: using resolver nightly-2015-12-30
Solver: using compiler ghc-7.10.3
Solver: asking cabal to calculate a build plan...
Solver: trying with packages from nightly-2015-12-30 as hard constraints...
Solver: attempt failed.

>>>> Cabal errors begin
cabal: Could not resolve dependencies:
next goal: lens (user goal)
rejecting: lens-4.13.1 (global constraint requires ==4.13)
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, 4.6.0.1, 4.6, 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 (global constraint requires ==4.13.1)
Dependency tree exhaustively searched.
<<<< Cabal errors end

Solver: retrying with packages from nightly-2015-12-30 as preferences...
Solver: attempt failed.

>>>> Cabal errors begin
cabal: Could not resolve dependencies:
next goal: lens (user goal)
rejecting: lens-4.13 (global constraint requires ==4.13.1)
trying: lens-4.13.1
trying: base-4.8.2.0/installed-0d6... (dependency of lens-4.13.1)
trying: lens-examples-0.1 (user goal)
next goal: gloss (dependency of lens-examples-0.1)
rejecting: gloss-1.9.4.1, 1.9.3.1, 1.9.2.1, 1.9.1.1, 1.8.2.2, 1.8.2.1,
1.8.1.2, 1.8.1.1, 1.8.0.1 (conflict: lens-examples => gloss==1.7.*)
rejecting: gloss-1.7.8.4, 1.7.8.3, 1.7.8.2, 1.7.8.1 (conflict:
base==4.8.2.0/installed-0d6..., gloss => base==4.6.*)
rejecting: gloss-1.7.7.201204.1 (conflict: base==4.8.2.0/installed-0d6...,
gloss => base==4.5.*)
rejecting: gloss-1.7.7.1, 1.7.6.6, 1.7.6.5, 1.7.6.4, 1.7.6.3, 1.7.6.2
(conflict: base => ghc-prim==0.4.0.0/installed-6cd..., gloss => ghc-prim>=0.2
&& <0.4)
rejecting: gloss-1.7.6.1 (conflict: base =>
ghc-prim==0.4.0.0/installed-6cd..., gloss => ghc-prim==0.3.*)
rejecting: gloss-1.7.5.2, 1.7.5.1, 1.7.4.1, 1.7.3.1, 1.7.2.1, 1.7.1.1, 1.7.0.1
(conflict: base => ghc-prim==0.4.0.0/installed-6cd..., gloss =>
ghc-prim==0.2.*)
rejecting: gloss-1.6.2.1, 1.6.1.1, 1.6.0.1, 1.5.2.1, 1.5.0.2, 1.5.0.1,
1.4.0.1, 1.3.4.1, 1.3.3.1, 1.3.1.2, 1.3.0.1, 1.2.0.1, 1.2.0.0, 1.1.1.0,
1.1.0.0, 1.0.0.2, 1.0.0.1, 1.0.0.0 (conflict: lens-examples => gloss==1.7.*)
Dependency tree exhaustively searched.
<<<< Cabal errors end

Solver could not resolve package dependencies. You can try one or more of the following:
- If the problem is due to a stale package index you can try again after udating the package index with 'stack update'.
- Create pivot points for the solver by specifying some extra dependencies in stack.yaml and then use 'stack solver' to figure out the rest of the  dependencies.
- Check if you missed adding a custom package or remote package location needed to build your package. Also, you may want to remove any unnecessary packages causing dependency problems.
- Use '--ignore-subdirs' to avoid using unwanted .cabal files in subdirectories.