bjoernager/rust
bjoernager/rust
1
Fork 0
Code Activity

Rollup merge of #110110 - lukas-code:display-panic-info, r=JohnTitor

Browse source 
Use `Display` in top-level example for `PanicInfo`

Addresses https://github.com/rust-lang/rust/issues/110098.

This confused me as well, when I was writing a `no_std` panic handler for the first time, so here's a better top-level example.

`Display` is stable, prints the `.message()` if available, and falls back to `.payload().downcast_ref<&str>()` if the message is not available. So this example should provide strictly more information and also work for formatted panics.

The old example still exists on the `payload` method.
This commit is contained in:
Matthias Krüger 2023-04-14 21:11:12 +02:00 • committed by GitHub
commit 5107c4c556
No known key found for this signature in database
GPG key ID: 4AEE18F83AFDEB23
1 changed files with 2 additions and 6 deletions
Download patch file Download diff file Expand all files Collapse all files

8
library/core/src/panic/panic_info.rs
View file

@ -15,14 +15,10 @@ use crate::panic::Location;
/// use std::panic; /// use std::panic;
/// ///
/// panic::set_hook(Box::new(|panic_info| { /// panic::set_hook(Box::new(|panic_info| {
/// if let Some(s) = panic_info.payload().downcast_ref::<&str>() { /// println!("panic occurred: {panic_info}");
/// println!("panic occurred: {s:?}");
/// } else {
/// println!("panic occurred");
/// }
/// })); /// }));
/// ///
/// panic!("Normal panic"); /// panic!("critical system failure");
/// ``` /// ```
#[lang = "panic_info"] #[lang = "panic_info"]
#[stable(feature = "panic_hooks", since = "1.10.0")] #[stable(feature = "panic_hooks", since = "1.10.0")]