Description
Current documentation for core::panic::PanicInfo uses examples with downcast_ref and an unwrap. I was just porting over some old no_std code and copied over the examples for testing. However in a no_std codebase this leads to infinite recursion and probably stack exhaustion or other weird behavior depending on the design of the system implementing the panic.
I think that the example should be changed from:
println!("panic occurred: {:?}", panic_info.payload().downcast_ref::<&str>().unwrap());
to something like:
println!("panic occurred: {:?}", panic_info.payload().downcast_ref::<&str>().unwrap_or("Payload unavailable"));
Or switching to if let to handle the None case.
Not really that big of an issue, but I think any panic handler examples in the documentation should not be able to recursively panic.