Welcome to Rust in Android
Rust is supported for system software on Android. This means that you can write new services, libraries, drivers or even firmware in Rust (or improve existing code as needed).
The speaker may mention any of the following given the increased use of Rust in Android:
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Service example: DNS over HTTP.
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Libraries: Rutabaga Virtual Graphics Interface.
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Kernel Drivers: Binder.
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Firmware: pKVM firmware.