Improve error message when using popuntil with bad predicate (#57247)

https://dart.googlesource.com/external/github.com/flutter/flutter/+/68037a23afa48b3cb9db574ea64aa553c053ecb4
1 file changed
tree: d631ec760288b4b5f69c30154a7922d408e662e3
  1. commits.json