Module X has been defined multiple times

I see lots of these errors every time I do `M-x psci`. However, `pulp psci` from the project root works just fine.

I've managed to solve this problem by customizing Psci/Arguments (I removed `bower_components/purescript-*/src/**/*.purs`).

I don't know why it worked (and have no time to dig it).

So I'll just leave it here for those who encounter the same problem.