Trait SpanDiagnosticExt 

pub trait SpanDiagnosticExt {
    // Required methods
    fn error<T: Into<String>>(self, message: T) -> Diagnostic;
    fn warning<T: Into<String>>(self, message: T) -> Diagnostic;
    fn note<T: Into<String>>(self, message: T) -> Diagnostic;
    fn help<T: Into<String>>(self, message: T) -> Diagnostic;
}

Extension trait for proc_macro2::Span emulating the proc-macro diagnostic API on stable and nightly.

Example

use proc_macro2::Span;
use proc_macro2_diagnostics::SpanDiagnosticExt;

let span = Span::call_site();
let diag = span.error("there's a problem here...");

// emit into an expression context.
let tokens = diag.emit_as_expr_tokens();

// or emit into an item context.
let tokens = diag.emit_as_item_tokens();

Required Methods

fn error<T: Into<String>>(self, message: T) -> Diagnostic

Create a new Diagnostic of the kind of this method’s name with the span self.

fn warning<T: Into<String>>(self, message: T) -> Diagnostic

Create a new Diagnostic of the kind of this method’s name with the span self.

fn note<T: Into<String>>(self, message: T) -> Diagnostic

Create a new Diagnostic of the kind of this method’s name with the span self.

fn help<T: Into<String>>(self, message: T) -> Diagnostic

Create a new Diagnostic of the kind of this method’s name with the span self.

Dyn Compatibility

This trait is not dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety", so this trait is not object safe.

Implementations on Foreign Types

impl SpanDiagnosticExt for Span

fn error<T: Into<String>>(self, message: T) -> Diagnostic

fn warning<T: Into<String>>(self, message: T) -> Diagnostic

fn note<T: Into<String>>(self, message: T) -> Diagnostic

fn help<T: Into<String>>(self, message: T) -> Diagnostic

Implementors