Compiler warning in Dart 2.1.0 when verifying void returning methods

[v3rm0n]

Looks like Dart 2.1.0 has a change that generates a compiler warning when you are using a void returning expression inside a method call dart-lang/sdk@9eac90d

So

verify(cat.sleep());

Will cause

compiler message: test/src/cat_test.dart:94:35: Warning: This expression has type 'void' and can't be used.
compiler message:         verify(cat.sleep());
compiler message:                    ^

[MichaelRFairhurst]

Thanks for filing! This is a known SDK bug: dart-lang/sdk#30470 (comment)

[MichaelRFairhurst]

You can work around this warning by casting to dynamic (which is free):

verify(cat.sleep() as dynamic);

But you should not have to do this once the bug is fixed!

[srawlins]

Dart 2.1.0 is not released yet. Which 2.1.0-dev version is this?

[MichaelRFairhurst]

I think all of them

[kmillikin]

This should be fixed by dart-lang/sdk@9bdf248. How can we verify that?

[srawlins]

I think this has been fixed. We haven't bumped into this in over a year.