DiagMessage in rustc_errors - Rust
Description: Abstraction over a message in a diagnostic to support both translatable and non-translatable diagnostic messages.

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## DiagMessage

# Enum DiagMessage

    pub enum DiagMessage {
        Str(Cow<'static, str>),
        Inline(Cow<'static, str>),
    }

Expand description

Abstraction over a message in a diagnostic to support both translatable and non-translatable diagnostic messages.

Intended to be removed once diagnostics are entirely translatable.

## Variants§

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### Str(Cow<'static, str>)

Non-translatable diagnostic message or a message that has been translated eagerly.

Some diagnostics have repeated subdiagnostics where the same interpolated variables would be instantiated multiple times with different values. These subdiagnostics’ messages are translated when they are added to the parent diagnostic. This is one of the ways this variant of `DiagMessage` is produced.

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### Inline(Cow<'static, str>)

An inline Fluent message, containing the to be translated diagnostic message.

## Implementations§

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### impl DiagMessage

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

## Trait Implementations§

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### impl Clone for DiagMessage

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#### fn clone(&self) -> DiagMessage

Returns a duplicate of the value. Read more
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#### fn clone_from(&mut self, source: &Self)

Performs copy-assignment from `source`. Read more
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### impl Debug for DiagMessage

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

Formats the value using the given formatter. Read more
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### impl<__D> Decodable<__D> for DiagMessage
where __D: SpanDecoder,

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#### fn decode(__decoder: &mut __D) -> DiagMessage

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### impl DiagMessageAddArg for DiagMessage

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#### fn arg( self, name: impl Into<DiagArgName>, arg: impl IntoDiagArg, ) -> EagerDiagMessageBuilder

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### impl<__E> Encodable<__E> for DiagMessage
where __E: SpanEncoder,

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#### fn encode(&self, __encoder: &mut __E)

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### impl Eq for DiagMessage

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### impl From<&'static str> for DiagMessage

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#### fn from(s: &'static str) -> DiagMessage

Converts to this type from the input type.
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### impl From<Cow<'static, str>> for DiagMessage

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#### fn from(s: Cow<'static, str>) -> DiagMessage

Converts to this type from the input type.
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### impl From<String> for DiagMessage

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#### fn from(s: String) -> DiagMessage

Converts to this type from the input type.
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### impl Hash for DiagMessage

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#### fn hash<__H>(&self, state: &mut __H)
where __H: Hasher,

Feeds this value into the given `Hasher`. Read more
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#### fn hash_slice<H>(data: &[Self], state: &mut H)
where H: Hasher, Self: Sized,

Feeds a slice of this type into the given `Hasher`. Read more
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### impl PartialEq for DiagMessage

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#### fn eq(&self, other: &DiagMessage) -> bool

Tests for `self` and `other` values to be equal, and is used by `==`.
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#### fn ne(&self, other: &Rhs) -> bool

Tests for `!=`. The default implementation is almost always sufficient, and should not be overridden without very good reason.
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### impl StableHash for DiagMessage

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#### fn stable_hash<__Hcx>( &self, __hcx: &mut __Hcx, __hasher: &mut StableHasher<SipHasher128>, )
where __Hcx: StableHashCtxt,

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### impl StructuralPartialEq for DiagMessage

## Auto Trait Implementations§

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### impl DynSend for DiagMessage

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### impl DynSync for DiagMessage

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### impl Freeze for DiagMessage

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### impl RefUnwindSafe for DiagMessage

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### impl Send for DiagMessage

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### impl Sync for DiagMessage

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### impl Unpin for DiagMessage

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### impl UnsafeUnpin for DiagMessage

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### impl UnwindSafe for DiagMessage

## Blanket Implementations§

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### impl<T> Aligned for T

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#### const ALIGN: Alignment

Alignment of `Self`.
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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> AnyEq for T
where T: Any + PartialEq,

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#### fn equals(&self, other: &(dyn Any + 'static)) -> bool

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#### fn as_any(&self) -> &(dyn Any + 'static)

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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> CloneToUninit for T
where T: Clone,

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#### unsafe fn clone_to_uninit(&self, dest: *mut u8)

🔬This is a nightly-only experimental API. (`clone_to_uninit`)
Performs copy-assignment from `self` to `dest`. Read more
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### impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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#### fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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### impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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#### fn equivalent(&self, key: &K) -> bool

Checks if this value is equivalent to the given key. Read more
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### impl<Q, K> Equivalent<K> for Q
where Q: Eq + ?Sized, K: Borrow<Q> + ?Sized,

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#### fn equivalent(&self, key: &K) -> bool

Compare self to `key` and return `true` if they are equal.
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### impl<T> ErasedDestructor for T
where T: 'static,

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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> Instrument for T

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#### fn instrument(self, span: Span) -> Instrumented<Self>

Instruments this type with the provided `Span`, returning an `Instrumented` wrapper. Read more
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#### fn in_current_span(self) -> Instrumented<Self>

Instruments this type with the current `Span`, returning an `Instrumented` wrapper. Read more
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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> IntoEither for T

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#### fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts `self` into a `Left` variant of `Either<Self, Self>` if `into_left` is `true`. Converts `self` into a `Right` variant of `Either<Self, Self>` otherwise. Read more
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#### fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts `self` into a `Left` variant of `Either<Self, Self>` if `into_left(&self)` returns `true`. Converts `self` into a `Right` variant of `Either<Self, Self>` otherwise. Read more
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### impl<T> Pointable for T

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#### const ALIGN: usize

The alignment of pointer.
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#### type Init = T

The type for initializers.
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#### unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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#### unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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#### unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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#### unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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### impl<T> Same for T

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#### type Output = T

Should always be `Self`
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### impl<T> ToOwned for T
where T: Clone,

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#### type Owned = T

The resulting type after obtaining ownership.
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#### fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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#### fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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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.
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### impl<T> WithSubscriber for T

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#### fn with_subscriber<S>(self, subscriber: S) -> WithDispatch<Self>
where S: Into<Dispatch>,

Attaches the provided `Subscriber` to this type, returning a `WithDispatch` wrapper. Read more
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#### fn with_current_subscriber(self) -> WithDispatch<Self>

Attaches the current default `Subscriber` to this type, returning a `WithDispatch` wrapper. Read more

## Layout§

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain `repr(...)` attributes. Please see the Rust Reference's “Type Layout” chapter for details on type layout guarantees.

Size: 32 bytes

Size for each variant:

- `Str`: 24 bytes
- `Inline`: 24 bytes