`discarded_futures` : Unwaited return for when Future is expected

[bsz0206]

Unwaited does work only on void returns. We are forced to ignore, which is not nice:

FutureBuilder(
// ignore: discarded_futures
future: asyncCall(),

Unwaited does work only on void returns:
FutureBuilder(
future: unawaited(asyncCall()),,

[devoncarew]

Thanks for the report; this repo is for proposals to add existing lints to our recommended lint set. You might want to re-file this at the dart-lang/sdk repo?

[bsz0206]

thanks. can you refer me to the page?

[lrhn]

The discarded_futures lint is causing a lot of confusion. It's name doesn't match it's description, and it's unclear which the implementation is matching, if either.

The description doesn't say that using unawaitedshould have any effect.
To turn off the lint, you should change the surrounding function to being async.

See #59204.

[FMorschel]

Hey @bsz0206, considering #59204, I've tested

import 'dart:async';

Future<void> f() async {}

void g() {
  unawaited(f());
}

And got no lint, so I think this can be closed?

---

If you have any other problems with the FutureBuilder widget, you may want to have a look at (which are all duplicates):

• discarded_futures lint false positive #59504
• Possible false positive in discarded_futures lint #58889
• update discarded_futures lint rule to not trigger when a widget expect a futur #59455
• [analyzer] False positives for discarded_futures when passing future-returning function call as an argument #59151
• discarded_futures false positive? #59387