addToStderr method
adds the line
to the stderr controller
Implementation
void addToStderr(String line) {
if (!_closed) {
if (includeStderr) {
_stderrController.sink.add(line);
} else {
Settings().verbose('addToStderr excluded: line=$line');
}
} else {
Settings().verbose('addToStderr called after stream closed: line=$line');
}
}