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Does "ARM support" include bare-metal arm at all? I know there are several projects that move in that direction, but it's not obvious to me how mature they are relative to the rest of Rust (granting that everything in the ecosystem is in an early state)...

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Rust exists to support Servo, and Servo's most important platform may very well be Android. I expect that Rust will see a lot of interest by hobbyists who hack the compiler to work with various fringe platforms, but in terms of official support I wouldn't expect Mozilla and Samsung to contribute anything beyond what's required for Android.

I hope Servo will be important for non Android mobile Linux as well.

Rust builds for straight up ARM, see https://zinc.rs/

Now we only need to dependencies for Servo to move along and it could work. I would imagine this would be a lot of work for the OpenGL implementation they use.

I should try building Rust with Mer SDK. Would be useful for Nemo, Sailfish and Plasma Active. Weren't Samsung also working on Servo? Did they consider it for Tizen as well?

They should keep in mind that the Vulkan API is also coming soon, and I imagine it will be integrated in Android 7.0 next year.

I have a vague memory that the Samsung work was partly done by their non-Android Bada OS team, which would make sense as Android is in many ways tied to Webkit/Blink/Chrome.

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