Struct serde::lib::core::panic::PanicInfo

1.10.0 · source · []
pub struct PanicInfo<'a> {
    payload: &'a (dyn Any + Send + 'static),
    message: Option<&'a Arguments<'a>>,
    location: &'a Location<'a>,
    can_unwind: bool,
}
Expand description

A struct providing information about a panic.

PanicInfo structure is passed to a panic hook set by the set_hook function.

Examples

use std::panic;

panic::set_hook(Box::new(|panic_info| {
    if let Some(s) = panic_info.payload().downcast_ref::<&str>() {
        println!("panic occurred: {s:?}");
    } else {
        println!("panic occurred");
    }
}));

panic!("Normal panic");

Fields

payload: &'a (dyn Any + Send + 'static)message: Option<&'a Arguments<'a>>location: &'a Location<'a>can_unwind: bool

Implementations

Returns the payload associated with the panic.

This will commonly, but not always, be a &'static str or String.

Examples
use std::panic;

panic::set_hook(Box::new(|panic_info| {
    if let Some(s) = panic_info.payload().downcast_ref::<&str>() {
        println!("panic occurred: {s:?}");
    } else {
        println!("panic occurred");
    }
}));

panic!("Normal panic");
🔬 This is a nightly-only experimental API. (panic_info_message)

If the panic! macro from the core crate (not from std) was used with a formatting string and some additional arguments, returns that message ready to be used for example with fmt::write

Returns information about the location from which the panic originated, if available.

This method will currently always return Some, but this may change in future versions.

Examples
use std::panic;

panic::set_hook(Box::new(|panic_info| {
    if let Some(location) = panic_info.location() {
        println!("panic occurred in file '{}' at line {}",
            location.file(),
            location.line(),
        );
    } else {
        println!("panic occurred but can't get location information...");
    }
}));

panic!("Normal panic");
🔬 This is a nightly-only experimental API. (panic_can_unwind)

Returns whether the panic handler is allowed to unwind the stack from the point where the panic occurred.

This is true for most kinds of panics with the exception of panics caused by trying to unwind out of a Drop implementation or a function whose ABI does not support unwinding.

It is safe for a panic handler to unwind even when this function returns true, however this will simply cause the panic handler to be called again.

Trait Implementations

Formats the value using the given formatter. Read more

Formats the value using the given formatter. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more

Immutably borrows from an owned value. Read more

Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

Converts the given value to a String. Read more

The type returned in the event of a conversion error.

Performs the conversion.

The type returned in the event of a conversion error.

Performs the conversion.