It would actually have detected the issue facebook#18657.

It found the following counterexample:
```
[Scheduler`
      -> [task#2] sequence::Scheduling "8" with priority 3 resolved
      -> [task#1] promise::Request for "447b0ed" resolved with value "resolved 447b0ed!"`,"447b0ed",[{"priority":3,"text":"8"}],<function :: ["447b0ed"] => true, ["8"] => true>]
```
Reproduced by https://codesandbox.io/s/strange-frost-d4ujl?file=/src/App.js

Related to facebook#18669