Rust "Buffer tags"?

Apologies because this is a somewhat vague question and I haven't been able to spend much time because I'm somewhat lapsed user of the tag functionality of vi and no longer remember how to research.

My question is this- if I open a .scala file and type :CtrlpBufTag, I see a list of tags within the current file, without any creation of tag file.

Would anyone be able to help me how to achieve this with Rust. Or more reasonably, how to go about researching what's happening here (a question better suited for a vim forum perhaps... )?

Have you set up / installed rust.vim? I'm not a vim expert, but it claims to have "Source browsing with Tagbar", and from what I can tell ctrlp's buffertag functionality is based on tagbar's.

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