rust/tests/ui/no_std/no-std-unwind-binary.rs

//@ needs-unwind
//@ compile-flags: -Cpanic=unwind

// Make sure that we don't emit an error message mentioning internal lang items.

#![no_std]
#![no_main]

#[panic_handler]
fn handler(_info: &core::panic::PanicInfo<'_>) -> ! {
    loop {}
}

fn main() {}

//~? ERROR unwinding panics are not supported without std
Stop mentioning internal lang items in no_std binary errors When writing a no_std binary, you'll be greeted with nonsensical errors mentioning lang items like eh_personality and start. That's pretty bad because it makes you think that you need to define them somewhere! But oh no, now you're getting the `internal_features` lint telling you that you shouldn't use them! But you need a no_std binary! What now? No problem! Writing a no_std binary is super easy. Just use panic=abort and supply your own platform specific entrypoint symbol (like `main`) and you're good to go. Would be nice if the compiler told you that, right? This makes it so that it does do that. 2023-10-02 12:32:31 +00:00			`//@ needs-unwind`
			`//@ compile-flags: -Cpanic=unwind`

			`// Make sure that we don't emit an error message mentioning internal lang items.`

			`#![no_std]`
			`#![no_main]`

			`#[panic_handler]`
			`fn handler(_info: &core::panic::PanicInfo<'_>) -> ! {`
			`loop {}`
			`}`

			`fn main() {}`
compiletest: Require `//~` annotations even if `error-pattern` is specified 2025-03-29 02:41:32 +03:00
			`//~? ERROR unwinding panics are not supported without std`