Rename ParseSess::with_span_handler as ParseSess::with_dcx.

Author: nnethercote

clippy_lints/src/doc/needless_doctest_main.rs

@@ -46,9 +46,9 @@ pub fn check(
                     rustc_errors::fallback_fluent_bundle(rustc_driver::DEFAULT_LOCALE_RESOURCES.to_vec(), false);
                 let emitter = EmitterWriter::new(Box::new(io::sink()), fallback_bundle);
                 let handler = DiagCtxt::with_emitter(Box::new(emitter)).disable_warnings();
-                #[expect(clippy::arc_with_non_send_sync)] // `Lrc` is expected by with_span_handler
+                #[expect(clippy::arc_with_non_send_sync)] // `Lrc` is expected by with_dcx
                 let sm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
-                let sess = ParseSess::with_span_handler(handler, sm);
+                let sess = ParseSess::with_dcx(handler, sm);
 
                 let mut parser = match maybe_new_parser_from_source_str(&sess, filename, code) {
                     Ok(p) => p,