error: extern location for std does not exist: | |
error: `#[panic_handler]` function required, but not found | |
error: unwinding panics are not supported without std | |
| | |
= help: using nightly cargo, use -Zbuild-std with panic="abort" to avoid unwinding | |
= note: since the core library is usually precompiled with panic="unwind", rebuilding your crate with panic="abort" may not be enough to fix the problem | |
error: requires `sized` lang_item | |
error: aborting due to 4 previous errors | |