pub enum DiagnosticMessage {
    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.



Non-translatable diagnostic message.

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

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


Given a SubdiagnosticMessage which may contain a Fluent attribute, create a new DiagnosticMessage that combines that attribute with the Fluent identifier of self.

  • If the SubdiagnosticMessage is non-translatable then return the message as a DiagnosticMessage.
  • If self is non-translatable then return self’s message.

Returns the String contained within the DiagnosticMessage::Str variant, assuming that this diagnostic message is of the legacy, non-translatable variety. Panics if this assumption does not hold.

Don’t use this - it exists to support some places that do comparison with diagnostic strings.

Trait Implementations

Returns a copy of the value. Read more

Performs copy-assignment from source. Read more

Formats the value using the given formatter. Read more

From impl that enables existing diagnostic calls to functions which now take impl Into<DiagnosticMessage> to continue to work as before.

Converts to this type from the input type.

Feeds this value into the given Hasher. Read more

Feeds a slice of this type into the given Hasher. Read more

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

Converts this type into the (usually inferred) input type.

This method tests for self and other values to be equal, and is used by ==. Read more

This method tests for !=.

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.

The resulting type after obtaining ownership.

Creates owned data from borrowed data, usually by cloning. Read more

Uses borrowed data to replace owned data, usually by cloning. 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.


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: 72 bytes

Size for each variant:

  • Str: 24 bytes
  • FluentIdentifier: 64 bytes