...
INFO: Recompiling stale cache file /home/travis/.julia/lib/v0.4/DataFrames.ji for module DataFrames.
INFO: Recompiling stale cache file /home/travis/.julia/lib/v0.4/DataArrays.ji for module DataArrays.
WARNING: Module Reexport uuid did not match cache file
WARNING: deserialization checks failed while attempting to load cache from /home/travis/.julia/lib/v0.4/DataArrays.ji
INFO: Recompiling stale cache file /home/travis/.julia/lib/v0.4/DataArrays.ji for module DataArrays.
WARNING: Module Reexport uuid did not match cache file
ERROR: LoadError: LoadError: __precompile__(true) but require failed to create a precompiled cache file
...
Needed to avoid test failures like
over at https://travis-ci.org/dcjones/Gadfly.jl/jobs/78317591. (Needs a new release tagged, too.)