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

//@ compile-flags: -Cpanic=abort --emit link
//@ error-pattern:using `fn main` requires the standard library

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

#![no_std]

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

fn main() {}
[AUTO-GENERATED] Migrate ui tests from `//` to `//@` directives 2024-02-16 14:02:50 -06:00			`//@ compile-flags: -Cpanic=abort --emit link`
			//@ error-pattern:using `fn main` requires the standard library
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 07:32:31 -05:00
			`// Make sure that we don't emit an error message mentioning internal lang items.`

			`#![no_std]`

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

			`fn main() {}`