Integration with help-fns and find-func

[ubolonton]

• Signature should use argument names defined in Rust, instead of ARG1, ARG2, like currently. This can be done by either:
  • Using advertised-signature-table.
  • Adding usage: to the end of the docstring.
• find-function should be able to find the correct location in Rust source.
  • Source files should be packaged together with the dylib (e.g. in a tar archive).
  • The dylib should contain more metadata for each exported function.

[ubolonton]

Function signatures were fixed in 0.10.3.

[cireu]

I check the Remacs's implementation of find-func integration. They add extra Elisp function to the source tree to do this.

My opinion is create another package in Elisp and submit it to some ELPA.