tree 890a51c33ef142bfa085588163695ff87dd84dd4
parent 51a93d9fa37d1b0ae034ca2190c2bdc9ce77ec4f
author Robert Nystrom <rnystrom@google.com> 1614387187 -0800
committer Robert Nystrom <rnystrom@google.com> 1614387187 -0800

Fix a couple of crashes I found when testing the migration on a corpus.

There are basically three issues here:

- The debug library, which isn't part of the public API, could crash
  when logging a chunk that wasn't fully initialized. Turned
  NestingLevel from late back to nullable to fix this. This doesn't
  affect users.

- The null safety migration introduced a crash when formatting blocks
  inside string interpolation (why would someone do that?!). To fix
  that, instead of returning null chunks, changed ChunkBuilder to
  return dummy chunks. They end up getting discarded anyway.

- Cascaded index operators always crash. I need to investigate more, but
  I think this bug may exist in the previous version of dart_style,
  which is in the SDK. I'll look into that next.