This issue is a variant of #134225. I am filing this issue on behalf of @zesterer, who discovered this.
This code currently compiles:
#![no_std]
#[panic_handler]
unsafe fn handle(_: &core::panic::PanicInfo) -> ! {
loop {}
}Presumably, this causes this unsafe function to be called if a panic happens. This is unsound, as this calls an unsafe function without considering its safety requirements.
Cursory github search for code that relies on this compiling: https://github.com/search?q=language%3Arust+%2F%23%5C%5Bpanic_handler%5C%5D%5Cnunsafe%2F&type=code
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Reproducible on the playground with version 1.100.0-nightly (2026-09-17 330d317121e16b5db8e5)
This issue is a variant of #134225. I am filing this issue on behalf of @zesterer, who discovered this.
This code currently compiles:
Presumably, this causes this unsafe function to be called if a panic happens. This is unsound, as this calls an unsafe function without considering its safety requirements.
Cursory github search for code that relies on this compiling: https://github.com/search?q=language%3Arust+%2F%23%5C%5Bpanic_handler%5C%5D%5Cnunsafe%2F&type=code
Meta
Reproducible on the playground with version
1.100.0-nightly (2026-09-17 330d317121e16b5db8e5)