| error[E0463]: can't find crate for `core` | |
| | | |
| = note: the `thumbv7em-none-eabihf` target may not be installed | |
| = help: consider downloading the target with `rustup target add thumbv7em-none-eabihf` | |
| = help: consider building the standard library from source with `cargo build -Zbuild-std` | |
| error: aborting due to 1 previous error | |
| For more information about this error, try `rustc --explain E0463`. |