[durin42]

> rewrite a large part of hg in Rust

That's not really the right story. The motivating factor is that we'd like to write /less C/, not /less Python/. It's likely in the long-term that parts of the code that are performance sensitive will move out of Python, but we've been doing that for years, and we just keep finding new things to optimize as the scale of Mercurial repositories keeps increasing.

[arunc]

Really a question to indygreg, but just curious to know if you considered using D with pyd? What are your thoughts?