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The GitHub page for emacs-racer shows function signatures in company completion results.

https://github.com/racer-rust/emacs-racer/raw/master/images/racer_completion.png

My results display "Function" and nothing beyond.

enter image description here

I've searched through customize-group company and can't find any variables that seem to be relevant. How can I achieve the advertised behavior?

I do not believe the problem is with the racer command itself. It works as expected when invoked from the command line, and eldoc-mode displays correct signatures.

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This issue occurs if emacs-racer and company-racer are both installed. They are distinct packages and are not compatible. Install only emacs-racer and the function signatures show up as expected.

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    Please, accept your own answer to mark this question as solved. Thanks in advance.
    – Tobias
    Commented May 31, 2016 at 14:57

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