Related issue: https://github.com/esp-rs/esp-hal/issues/495 esp-hal's `usb_serial` example works with the Xtensa-enabled Rust compiler 1.65 and 1.66 but not with 1.67, 1.68 or 1.69 Same issue with another example here: https://github.com/bjoernQ/esp32s3-hid-example