src/vs/editor/contrib/gotoSymbol/browser/referencesModel.ts/OneReference/ariaMessage
class OneReference:	get ariaMessage(): string {

		const preview = this.parent.getPreview(this)?.preview(this.range);

		if (!preview) {
			return localize(
				'aria.oneReference', "symbol in {0} on line {1} at column {2}",
				basename(this.uri), this.range.startLineNumber, this.range.startColumn
			);
		} else {
			return localize(
				{ key: 'aria.oneReference.preview', comment: ['Placeholders are: 0: filename, 1:line number, 2: column number, 3: preview snippet of source code'] }, "symbol in {0} on line {1} at column {2}, {3}",
				basename(this.uri), this.range.startLineNumber, this.range.startColumn, preview.value
			);
		}
	}