Further information on duplicates

It would be useful if there were a way to see where the duplicates files came from in the problems panel, or some notes in the output of how to address the issue. I see many entries like below but have no idea how to solve it and there's no further guidance. If I run webpack itself with `--display-modules` I don't see duplicate occurrences of `MyComponent` so I can't tell how to resolve this issue.

```
vue-loader/lib/index.js??vue-loader-options!/path/to/MyComponent.vue?vue&type=style&index=0&lang=css&
```