Rust on Microcontrollers?

Is there any interest or effort to implement rust on microcontrollers? Like the Pi Pico or ESP modules? There is CPython, MicroPython, etc. So thinking, ah, maybe 'MicroRust' project?

Rust already cross-compiles to some common uC targets such as the AVR or ARM Cortex-M.

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Yes, there is lots of interest and many efforts ongoing. See the Rust on Embedded Devices working group for more information: Rust Embedded · GitHub.

See also projects like Rust on ESP and Rust on RP series.