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Is this language agnostic, supporting all GDB's languages, or is there a specific set of languages that it supports?

(GDB supports eg Ada, Fortran and Rust)

edit: I had a look: the web page says "C/C++", there is some evidence on the bug tracker of people using it with Rust. So my own quick peek was inconclusive.

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It is a gdb protocol server. All of language support is on the side of gdb client, so yes, it's language agnostic.

Indeed, rr has worked with Rust since at least 2015 ( http://huonw.github.io/blog/2015/10/rreverse-debugging/ ), and I see the author of rr around the Rust community enough (I believe he works at Mozilla?) that I doubt this has regressed in the meantime.

roc left Mozilla back in 2016. https://robert.ocallahan.org/2016/03/leaving-mozilla.html

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