## DiagMessage

# Enum DiagMessage

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    pub enum DiagMessage {
        Str(Cow<'static, str>),
        Translated(Cow<'static, str>),
        FluentIdentifier(Cow<'static, str>, Option<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.

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

Translatable message which has been already translated.

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, producing this variant of `DiagMessage`.

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### FluentIdentifier(Cow<'static, str>, Option<Cow<'static, str>>)

Identifier for a Fluent message (with optional attribute) corresponding to the diagnostic message. Yet to be translated.

https://projectfluent.org/fluent/guide/hello.html https://projectfluent.org/fluent/guide/attributes.html

## Implementations§

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### impl DiagMessage

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#### pub fn with_subdiagnostic_message(&self, sub: SubdiagMessage) -> Self

Given a `SubdiagMessage` which may contain a Fluent attribute, create a new `DiagMessage` that combines that attribute with the Fluent identifier of `self`.

- If the `SubdiagMessage` is non-translatable then return the message as a `DiagMessage`.
- If `self` is non-translatable then return `self`’s message.

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#### 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

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

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

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

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

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

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

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>) -> Self

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

Translating into a subdiagnostic message from a diagnostic message is a little strange - but the subdiagnostic functions (e.g. `span_label`) take a `SubdiagMessage` and the subdiagnostic derive refers to typed identifiers that are `DiagMessage`s, so need to be able to convert between these, as much as they’ll be converted back into `DiagMessage` using `with_subdiagnostic_message` eventually. Don’t use this other than for the derive.

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#### fn from(val: DiagMessage) -> Self

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) -> Self

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

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

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 Eq for DiagMessage

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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 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

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

## 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: 48 bytes

Size for each variant:

- `Str`: 32 bytes
- `Translated`: 32 bytes
- `FluentIdentifier`: 48 bytes