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>the people working on it probably wouldn't be contributing to full Emacs >in the process of porting, someone notices a bug and so submits a patch upstream I

• coldtea 9y ago
  You probably meant conflicting. But it's not: one might very plausibly not care to hack on C emacs, but care to hack on a Rust emacs. And at the same time, the same person, might be able to spot a bug while porting C code to the Rust emacs, that will also help fix C-emacs.
• dbaupp 9y ago
  These aren't in opposition: it's what I meant by "on-boarding". If remacs didn't exist the hypothetical developer wouldn't be contributing to full Emacs (it never crossed their mind, or it's too intimidating, or whatever other reason), but through their work on remacs, they've also contributed to the original emacs. The point is that the latter contribution would never have happened without remacs.