On Julia 0.7-alpha I get this warning:
Warning: using A: B will only be allowed for single bindings, not modules. Use using A.B instead
import CmdStan: CmdStan, CMDSTAN_HOME, Diagnose, Optimize, Sample, Stanmodel, Variational, set_cmdstan_home!
works fine. Is there a reason for this?
What I’m really trying to do is reexport all symbols of CmdStan except one, which I want to extend (my idea of “stacked environments” 
and export the updated method
( https://github.com/goedman/StanStackedEnvironmentTest.jl ).
But maybe this is a bad idea and should use multiple dispatch for that?