Struct rustc_errors::diagnostic::Diagnostic

pub struct Diagnostic {
    pub(crate) level: Level,
    pub messages: Vec<(DiagnosticMessage, Style)>,
    pub code: Option<ErrCode>,
    pub span: MultiSpan,
    pub children: Vec<SubDiagnostic>,
    pub suggestions: Result<Vec<CodeSuggestion>, SuggestionsDisabled>,
    args: FxHashMap<DiagnosticArgName, DiagnosticArgValue>,
    pub sort_span: Span,
    pub is_lint: Option<IsLint>,
    pub emitted_at: DiagnosticLocation,
}

Fields

level: Level

messages: Vec<(DiagnosticMessage, Style)>

code: Option<ErrCode>

span: MultiSpan

children: Vec<SubDiagnostic>

suggestions: Result<Vec<CodeSuggestion>, SuggestionsDisabled>

args: FxHashMap<DiagnosticArgName, DiagnosticArgValue>

sort_span: Span

This is not used for highlighting or rendering any error message. Rather, it can be used as a sort key to sort a buffer of diagnostics. By default, it is the primary span of span if there is one. Otherwise, it is DUMMY_SP.

is_lint: Option<IsLint>

emitted_at: DiagnosticLocation

With -Ztrack_diagnostics enabled, we print where in rustc this error was emitted.

Implementations

impl Diagnostic

pub fn new<M: Into<DiagnosticMessage>>(level: Level, message: M) -> Self

pub fn new_with_messages( level: Level, messages: Vec<(DiagnosticMessage, Style)> ) -> Self

pub fn level(&self) -> Level

pub fn is_error(&self) -> bool

pub(crate) fn update_unstable_expectation_id( &mut self, unstable_to_stable: &FxIndexMap<LintExpectationId, LintExpectationId> )

pub(crate) fn has_future_breakage(&self) -> bool

Indicates whether this diagnostic should show up in cargo’s future breakage report.

pub(crate) fn is_force_warn(&self) -> bool

pub fn downgrade_to_delayed_bug(&mut self)

Delay emission of this diagnostic as a bug.

This can be useful in contexts where an error indicates a bug but typically this only happens when other compilation errors have already happened. In those cases this can be used to defer emission of this diagnostic as a bug in the compiler only if no other errors have been emitted.

In the meantime, though, callsites are required to deal with the “bug” locally in whichever way makes the most sense.

pub fn span_label( &mut self, span: Span, label: impl Into<SubdiagnosticMessage> ) -> &mut Self

Appends a labeled span to the diagnostic.

Labels are used to convey additional context for the diagnostic’s primary span. They will be shown together with the original diagnostic’s span, not with spans added by span_note, span_help, etc. Therefore, if the primary span is not displayable (because the span is DUMMY_SP or the source code isn’t found), labels will not be displayed either.

Implementation-wise, the label span is pushed onto the MultiSpan that was created when the diagnostic was constructed. However, the label span is not considered a “primary span”; only the Span supplied when creating the diagnostic is primary.

pub fn span_labels( &mut self, spans: impl IntoIterator<Item = Span>, label: &str ) -> &mut Self

Labels all the given spans with the provided label. See Self::span_label() for more information.

pub fn replace_span_with(&mut self, after: Span, keep_label: bool) -> &mut Self

pub fn note_expected_found( &mut self, expected_label: &dyn Display, expected: DiagnosticStyledString, found_label: &dyn Display, found: DiagnosticStyledString ) -> &mut Self

pub fn note_expected_found_extra( &mut self, expected_label: &dyn Display, expected: DiagnosticStyledString, found_label: &dyn Display, found: DiagnosticStyledString, expected_extra: &dyn Display, found_extra: &dyn Display ) -> &mut Self

pub fn note_trait_signature( &mut self, name: Symbol, signature: String ) -> &mut Self

pub fn note(&mut self, msg: impl Into<SubdiagnosticMessage>) -> &mut Self

Add a note attached to this diagnostic.

fn highlighted_note<M: Into<SubdiagnosticMessage>>( &mut self, msg: Vec<(M, Style)> ) -> &mut Self

pub fn note_once(&mut self, msg: impl Into<SubdiagnosticMessage>) -> &mut Self

Prints the span with a note above it. This is like Diagnostic::note(), but it gets its own span.

pub fn span_note<S: Into<MultiSpan>>( &mut self, sp: S, msg: impl Into<SubdiagnosticMessage> ) -> &mut Self

Prints the span with a note above it. This is like Diagnostic::note(), but it gets its own span.

pub fn span_note_once<S: Into<MultiSpan>>( &mut self, sp: S, msg: impl Into<SubdiagnosticMessage> ) -> &mut Self

Prints the span with a note above it. This is like Diagnostic::note(), but it gets its own span.

pub fn warn(&mut self, msg: impl Into<SubdiagnosticMessage>) -> &mut Self

Add a warning attached to this diagnostic.

pub fn span_warn<S: Into<MultiSpan>>( &mut self, sp: S, msg: impl Into<SubdiagnosticMessage> ) -> &mut Self

Prints the span with a warning above it. This is like Diagnostic::warn(), but it gets its own span.

pub fn help(&mut self, msg: impl Into<SubdiagnosticMessage>) -> &mut Self

Add a help message attached to this diagnostic.

pub fn help_once(&mut self, msg: impl Into<SubdiagnosticMessage>) -> &mut Self

Prints the span with a help above it. This is like Diagnostic::help(), but it gets its own span.

pub fn highlighted_help(&mut self, msg: Vec<(String, Style)>) -> &mut Self

Add a help message attached to this diagnostic with a customizable highlighted message.

pub fn span_help<S: Into<MultiSpan>>( &mut self, sp: S, msg: impl Into<SubdiagnosticMessage> ) -> &mut Self

Prints the span with some help above it. This is like Diagnostic::help(), but it gets its own span.

pub fn disable_suggestions(&mut self) -> &mut Self

Disallow attaching suggestions this diagnostic. Any suggestions attached e.g. with the span_suggestion_* methods (before and after the call to disable_suggestions) will be ignored.

fn push_suggestion(&mut self, suggestion: CodeSuggestion)

Helper for pushing to self.suggestions, if available (not disable).

pub fn multipart_suggestion( &mut self, msg: impl Into<SubdiagnosticMessage>, suggestion: Vec<(Span, String)>, applicability: Applicability ) -> &mut Self

Show a suggestion that has multiple parts to it. In other words, multiple changes need to be applied as part of this suggestion.

pub fn multipart_suggestion_verbose( &mut self, msg: impl Into<SubdiagnosticMessage>, suggestion: Vec<(Span, String)>, applicability: Applicability ) -> &mut Self

Show a suggestion that has multiple parts to it, always as it’s own subdiagnostic. In other words, multiple changes need to be applied as part of this suggestion.

pub fn multipart_suggestion_with_style( &mut self, msg: impl Into<SubdiagnosticMessage>, suggestion: Vec<(Span, String)>, applicability: Applicability, style: SuggestionStyle ) -> &mut Self

Diagnostic::multipart_suggestion() but you can set the SuggestionStyle.

pub fn tool_only_multipart_suggestion( &mut self, msg: impl Into<SubdiagnosticMessage>, suggestion: Vec<(Span, String)>, applicability: Applicability ) -> &mut Self

Prints out a message with for a multipart suggestion without showing the suggested code.

This is intended to be used for suggestions that are obvious in what the changes need to be from the message, showing the span label inline would be visually unpleasant (marginally overlapping spans or multiline spans) and showing the snippet window wouldn’t improve understandability.

pub fn span_suggestion( &mut self, sp: Span, msg: impl Into<SubdiagnosticMessage>, suggestion: impl ToString, applicability: Applicability ) -> &mut Self

Prints out a message with a suggested edit of the code.

In case of short messages and a simple suggestion, rustc displays it as a label:

try adding parentheses: `(tup.0).1`

The message

• should not end in any punctuation (a : is added automatically)
• should not be a question (avoid language like “did you mean”)
• should not contain any phrases like “the following”, “as shown”, etc.
• may look like “to do xyz, use” or “to do xyz, use abc”
• may contain a name of a function, variable, or type, but not whole expressions

See CodeSuggestion for more information.

pub fn span_suggestion_with_style( &mut self, sp: Span, msg: impl Into<SubdiagnosticMessage>, suggestion: impl ToString, applicability: Applicability, style: SuggestionStyle ) -> &mut Self

Diagnostic::span_suggestion() but you can set the SuggestionStyle.

pub fn span_suggestion_verbose( &mut self, sp: Span, msg: impl Into<SubdiagnosticMessage>, suggestion: impl ToString, applicability: Applicability ) -> &mut Self

Always show the suggested change.

pub fn span_suggestions( &mut self, sp: Span, msg: impl Into<SubdiagnosticMessage>, suggestions: impl IntoIterator<Item = String>, applicability: Applicability ) -> &mut Self

Prints out a message with multiple suggested edits of the code. See also Diagnostic::span_suggestion().

pub fn span_suggestions_with_style( &mut self, sp: Span, msg: impl Into<SubdiagnosticMessage>, suggestions: impl IntoIterator<Item = String>, applicability: Applicability, style: SuggestionStyle ) -> &mut Self

Diagnostic::span_suggestions() but you can set the SuggestionStyle.

pub fn multipart_suggestions( &mut self, msg: impl Into<SubdiagnosticMessage>, suggestions: impl IntoIterator<Item = Vec<(Span, String)>>, applicability: Applicability ) -> &mut Self

Prints out a message with multiple suggested edits of the code, where each edit consists of multiple parts. See also Diagnostic::multipart_suggestion().

pub fn span_suggestion_short( &mut self, sp: Span, msg: impl Into<SubdiagnosticMessage>, suggestion: impl ToString, applicability: Applicability ) -> &mut Self

Prints out a message with a suggested edit of the code. If the suggestion is presented inline, it will only show the message and not the suggestion.

See CodeSuggestion for more information.

pub fn span_suggestion_hidden( &mut self, sp: Span, msg: impl Into<SubdiagnosticMessage>, suggestion: impl ToString, applicability: Applicability ) -> &mut Self

Prints out a message for a suggestion without showing the suggested code.

This is intended to be used for suggestions that are obvious in what the changes need to be from the message, showing the span label inline would be visually unpleasant (marginally overlapping spans or multiline spans) and showing the snippet window wouldn’t improve understandability.

pub fn tool_only_span_suggestion( &mut self, sp: Span, msg: impl Into<SubdiagnosticMessage>, suggestion: impl ToString, applicability: Applicability ) -> &mut Self

Adds a suggestion to the JSON output that will not be shown in the CLI.

This is intended to be used for suggestions that are very obvious in what the changes need to be from the message, but we still want other tools to be able to apply them.

pub fn subdiagnostic( &mut self, subdiagnostic: impl AddToDiagnostic ) -> &mut Self

Add a subdiagnostic from a type that implements Subdiagnostic (see rustc_macros::Subdiagnostic).

pub fn eager_subdiagnostic( &mut self, dcx: &DiagCtxt, subdiagnostic: impl AddToDiagnostic ) -> &mut Self

Add a subdiagnostic from a type that implements Subdiagnostic (see rustc_macros::Subdiagnostic). Performs eager translation of any translatable messages used in the subdiagnostic, so suitable for use with repeated messages (i.e. re-use of interpolated variables).

pub fn span<S: Into<MultiSpan>>(&mut self, sp: S) -> &mut Self

pub fn is_lint(&mut self, name: String, has_future_breakage: bool) -> &mut Self

pub fn code(&mut self, code: ErrCode) -> &mut Self

pub fn clear_code(&mut self) -> &mut Self

pub fn get_code(&self) -> Option<ErrCode>

pub fn primary_message( &mut self, msg: impl Into<DiagnosticMessage> ) -> &mut Self

pub fn args(&self) -> impl Iterator<Item = DiagnosticArg<'_>>

pub fn arg( &mut self, name: impl Into<Cow<'static, str>>, arg: impl IntoDiagnosticArg ) -> &mut Self

pub fn replace_args( &mut self, args: FxHashMap<DiagnosticArgName, DiagnosticArgValue> )

pub fn messages(&self) -> &[(DiagnosticMessage, Style)]

fn subdiagnostic_message_to_diagnostic_message( &self, attr: impl Into<SubdiagnosticMessage> ) -> DiagnosticMessage

Helper function that takes a SubdiagnosticMessage and returns a DiagnosticMessage by combining it with the primary message of the diagnostic (if translatable, otherwise it just passes the user’s string along).

pub fn sub( &mut self, level: Level, message: impl Into<SubdiagnosticMessage>, span: MultiSpan )

Convenience function for internal use, clients should use one of the public methods above.

Used by proc_macro_server for implementing server::Diagnostic.

fn sub_with_highlights<M: Into<SubdiagnosticMessage>>( &mut self, level: Level, messages: Vec<(M, Style)>, span: MultiSpan )

Convenience function for internal use, clients should use one of the public methods above.

fn keys( &self ) -> (&Level, &[(DiagnosticMessage, Style)], &Option<ErrCode>, &MultiSpan, &[SubDiagnostic], &Result<Vec<CodeSuggestion>, SuggestionsDisabled>, Vec<(&DiagnosticArgName, &DiagnosticArgValue)>, &Option<IsLint>)

Fields used for Hash, and PartialEq trait

Trait Implementations

impl Clone for Diagnostic

fn clone(&self) -> Diagnostic

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for Diagnostic

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

Formats the value using the given formatter.

impl<__D: SpanDecoder> Decodable<__D> for Diagnostic

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

impl<__E: SpanEncoder> Encodable<__E> for Diagnostic

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

impl Hash for Diagnostic

fn hash<H>(&self, state: &mut H)

where H: Hasher,

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for Diagnostic

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

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

fn ne(&self, other: &Rhs) -> bool

This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

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: 256 bytes