After an entire day of fiddling, I added the concept of a type alias to the type system as a thing with a name in `rustc`, as opposed to something that gets immediately discarded, which will let it refer to type alias in type errors. Right now at 9197 passing, 44 failing tests.
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I was worried about async/await because it uses some features that were kryptonite for good diagnostics, but were rarely used in normal code so they never got any love. *Because* of the async/await stabilization a lot of effort was put into improving them.
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Writing about stuff to learn how it works, mostly in Rust.
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