Meta-issue for changes to other projects

[cpovirk]

Here are some things we should consider for the next feature push after 1.0, even though they would involve changes to projects other than Truth:

• Multline-friendly toString() for AutoValue
• More Error Prone checks for Truth usages [edit: internal bug 134041650]
  • In particular, see internal bug "EqualsIncompatibleType for Truth." (A version already exists but could be improved.)
• Changing Error Prone's testing library (the one that's based on BUG: Diagnostic contains) to use Fuzzy Truth
• Changing Compile-Testing (I think? whatever some of our Refaster tests use internally) to provide its expected and actual values to Truth in a format that we can turn into a ComparisonFailure [edit: internal bug 25861945, also https://github.com/google/compile-testing/issues/16]