Trait proc_macro_error::DiagnosticExt

pub trait DiagnosticExt: Sealed {
    // Required methods
    fn spanned_range(
        span_range: SpanRange,
        level: Level,
        message: String
    ) -> Self;
    fn span_range_error(self, span_range: SpanRange, msg: String) -> Self;
    fn span_range_help(self, span_range: SpanRange, msg: String) -> Self;
    fn span_range_note(self, span_range: SpanRange, msg: String) -> Self;
}

A collection of methods that do not exist in proc_macro::Diagnostic but still useful to have around.

This trait is sealed and cannot be implemented outside of proc_macro_error.

Required Methods

fn spanned_range(span_range: SpanRange, level: Level, message: String) -> Self

Create a new diagnostic message that points to the span_range.

This function is the same as Diagnostic::spanned but produces considerably better error messages for multi-token spans on stable.

fn span_range_error(self, span_range: SpanRange, msg: String) -> Self

Add another error message to self such that it will be emitted right after the main message.

This function is the same as Diagnostic::span_error but produces considerably better error messages for multi-token spans on stable.

fn span_range_help(self, span_range: SpanRange, msg: String) -> Self

Attach a “help” note to your main message, the note will have it’s own span on nightly.

This function is the same as Diagnostic::span_help but produces considerably better error messages for multi-token spans on stable.

Span

The span is ignored on stable, the note effectively inherits its parent’s (main message) span

fn span_range_note(self, span_range: SpanRange, msg: String) -> Self

Attach a note to your main message, the note will have it’s own span on nightly.

This function is the same as Diagnostic::span_note but produces considerably better error messages for multi-token spans on stable.

Span

The span is ignored on stable, the note effectively inherits its parent’s (main message) span

Implementors

impl DiagnosticExt for Diagnostic