Documentation for Isolate.spawn outdated

[mmcdon20]

This was noticed by a user on stackoverflow: https://stackoverflow.com/questions/73778870/is-dartdocs-about-the-entry-of-isolate-spawn-wrong-or-something

Currently the documentation says:

The function must be a top-level function or a static method that can be called with a single argument, that is, a compile-time constant function value which accepts at least one positional parameter and has at most one required positional parameter. The function may accept any number of optional parameters, as long as it can be called with just a single argument. The function must not be the value of a function expression or an instance method tear-off.

But it is possible now to pass a function expression or an instance method tear-off.

import 'dart:isolate';

void main() async {
  await Isolate.spawn((message) => print(message), 'function expression');
  await Isolate.spawn(MessagePrinter().printMessage, 'method tear-off');
}

class MessagePrinter {
  void printMessage(message) => print(message);
}

This appears to be possible since dart 2.15:

Allow closures both in inter-isolate messages as well as as entrypoints in Isolate.spawn(<entrypoint>, ...) calls.

[mraleph]

/cc @aam