40 columns                              |
>>> Break.
while (true) {
  break  ;
}
<<<
while (true) {
  break;
}
>>> Break to label.
while (true) {
  break  someLabel  ;
}
<<<
while (true) {
  break someLabel;
}
>>> Continue.
while (true) {
  continue  ;
}
<<<
while (true) {
  continue;
}
>>> Continue to label.
while (true) {
  continue  someLabel  ;
}
<<<
while (true) {
  continue someLabel;
}
>>> Yield.
Stream<String> i(String n) async* {
  yield   i   ;
}
<<<
Stream<String> i(String n) async* {
  yield i;
}
>>> Yield*.
Stream<int> i(int n) async* {
  yield * i (  n   - 1 )      ;
}
<<<
Stream<int> i(int n) async* {
  yield* i(n - 1);
}
>>> Await.
foo() async {
  await i (  1 + 2   )   ;
}
<<<
foo() async {
  await i(1 + 2);
}
>>> Throw.
throw   'error'
;
<<<
throw 'error';
>>> Throw doesn't split after the 'throw' keyword.
throw 'Some extremely long error message.';
<<<
throw 'Some extremely long error message.';
>>> Throw with long string literal.
throw new FormatException('This is a long exception message.');
<<<
throw new FormatException(
  'This is a long exception message.',
);
>>> Rethrow.
try {
  throw 1   ;
} catch    (e) {
       rethrow    ;}
<<<
try {
  throw 1;
} catch (e) {
  rethrow;
}