Is it expected that

SourcesPaths

can have an empty

.dirs

even when

.files

is set? context is this instance of `SourcesPaths`:

SourcesPaths(files=('src/jvm/org/pantsbuild/example/app/ExampleApp.scala',), dirs=())

I thought I had a ticket but guess not - I don't think

dirs

in general behaves how we want. At least one point in time, it would list every single dir encountered, whereas imo it should only list dirs with files in them