in lib/src/span_mixin.dart [53:67]
String message(String message, {color}) {
final buffer = StringBuffer()
..write('line ${start.line + 1}, column ${start.column + 1}');
if (sourceUrl != null) buffer.write(' of ${p.prettyUri(sourceUrl)}');
buffer.write(': $message');
final highlight = this.highlight(color: color);
if (highlight.isNotEmpty) {
buffer
..writeln()
..write(highlight);
}
return buffer.toString();
}