PanicMessage in core::panic - Rust
Description: A message that was given to the `panic!()` macro.

# Struct PanicMessage

1.81.0 · Source

    pub struct PanicMessage<'a> { /* private fields */ }

Expand description

A message that was given to the `panic!()` macro.

The `Display` implementation of this type will format the message with the arguments that were given to the `panic!()` macro.

See `PanicInfo::message`.

## Implementations§

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### impl<'a> PanicMessage<'a>

1.81.0 (const: 1.84.0) · Source

#### pub const fn as_str(&self) -> Option<&'static str>

Gets the formatted message, if it has no arguments to be formatted at runtime.

This can be used to avoid allocations in some cases.

##### §Guarantees

For `panic!("just a literal")`, this function is guaranteed to return `Some("just a literal")`.

For most cases with placeholders, this function will return `None`.

See `fmt::Arguments::as_str` for details.

## Trait Implementations§

1.81.0 · Source§

### impl Debug for PanicMessage<'_>

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#### fn fmt(&self, formatter: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more
1.81.0 · Source§

### impl Display for PanicMessage<'_>

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#### fn fmt(&self, formatter: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

## Auto Trait Implementations§

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### impl<'a> Freeze for PanicMessage<'a>

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### impl<'a> RefUnwindSafe for PanicMessage<'a>

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### impl<'a> !Send for PanicMessage<'a>

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### impl<'a> !Sync for PanicMessage<'a>

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### impl<'a> Unpin for PanicMessage<'a>

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### impl<'a> UnwindSafe for PanicMessage<'a>

## Blanket Implementations§

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### impl<T> Any for T
where T: 'static + ?Sized,

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#### fn type_id(&self) -> TypeId

Gets the `TypeId` of `self`. Read more
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### impl<T> Borrow<T> for T
where T: ?Sized,

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#### fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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### impl<T> BorrowMut<T> for T
where T: ?Sized,

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#### fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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### impl<T> From<T> for T

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#### fn from(t: T) -> T

Returns the argument unchanged.

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### impl<T, U> Into<U> for T
where U: From<T>,

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#### fn into(self) -> U

Calls `U::from(self)`.

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

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### impl<T, U> TryFrom<U> for T
where U: Into<T>,

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#### type Error = Infallible

The type returned in the event of a conversion error.
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#### fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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### impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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#### type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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#### fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.