heading method
Implementation
void heading(String name, [SourceSpan? span]) {
write(name);
if (span != null) {
buf.write(' (${span.message('')})');
}
buf.write('\n');
}
void heading(String name, [SourceSpan? span]) {
write(name);
if (span != null) {
buf.write(' (${span.message('')})');
}
buf.write('\n');
}