Smoke test analyzer 0.31.0-alpha.0 compatibility.

[pq]

FYI @kevmoo

(Not for landing.)

[kevmoo]

Thank you!

[pq]

Looks good to me. The breakage on Dart 1.23 is unsurprising and I take it not an issue. Having said that, we should maybe consider upping the Dart SDK constraints for front_end to be more than cosmetic (cc @sigmundch) since it can't run on anything less than 1.24.

[pq]

cc @grouma @stereotype441

[kevmoo]

Well, in the "real world" I'm guessing pkg/analyzer explicitly restricts 1.23, so this solve won't happen – right?

[pq]

Well, in the "real world" I'm guessing pkg/analyzer explicitly restricts 1.23, so this solve won't happen – right?

Actually no,

environment:
  sdk: '>=1.20.0 <2.0.0-dev.infinity'

FYI: @bwilkerson --- maybe worth bumping to 1.24.

[kevmoo]

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