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// TODO(@zkat): Error stuff has changed, so this needs updating.
// /// Show how to build your own diagnostics, without having to use the
// /// `fancy` feature or having `main()` return `miette::Result`
// ///
// use kdl::KdlDocument;
// use miette::Diagnostic;
// use miette::SourceSpan;
// #[derive(Debug)]
// pub struct MyError {
// pub message: String,
// }
// fn parse(input: &str) -> Result<KdlDocument, MyError> {
// let doc = input.parse::<KdlDocument>();
// doc.map_err(|error| {
// let source = error
// .source_code()
// .expect("parse errors should have source code");
// let help = error.help.unwrap_or_default();
// let span: SourceSpan = error.span;
// let contents = source
// .read_span(&span, 0, 0)
// .expect("source should have span contents");
// // miette uses 0 based indexes, but humans prefer 1-based
// let line = contents.line() + 1;
// let column = contents.column() + 1;
// let message = format!(
// "line {}, column {}: {}\n help: {}",
// line, column, error, help
// );
// MyError { message }
// })
// }