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Rollup merge of #52238 - frewsxcv:frewsxcv-unwrap, r=GuillaumeGomez

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Avoid unwrapping in PanicInfo doc example.

Fixes https://github.com/rust-lang/rust/issues/51768.
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Guillaume Gomez 2018-07-11 10:02:03 +02:00 committed by GitHub
commit c3d8236f8d
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1 changed files with 5 additions and 1 deletions
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6
src/libcore/panic.rs
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@ -30,7 +30,11 @@ use fmt;
/// use std::panic;
///
/// panic::set_hook(Box::new(|panic_info| {
/// println!("panic occurred: {:?}", panic_info.payload().downcast_ref::<&str>().unwrap());
/// if let Some(s) = panic_info.payload().downcast_ref::<&str>() {
/// println!("panic occurred: {:?}", s);
/// } else {
/// println!("panic occurred");
/// }
/// }));
///
/// panic!("Normal panic");