source.dot.net tooling doesn't support filenames of the same name

[KirillOsenkov]

@alexperovich I noticed that System.Private.CoreLib has at least two files called IEnumerable.cs, but only the first one is indexed:
https://source.dot.net/#q=ienumerable.cs

I'm guessing that the tool you're using flattens the list of files in a project, so only the first (non-generic) IEnumerable.cs survives.