Auto merge of #70679 - tmandry:issue-68112, r=nikomatsakis

Improve async-await/generator obligation errors in some cases

Fixes #68112.

This change is best read one commit at a time (I add a test at the beginning and update it in each change after).

The `test2` function is a case I found while writing the test that we don't handle with this code yet. I don't attempt to fix it in this PR, but it's a good candidate for future work.

r? @davidtwco, @nikomatsakis

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