bors a4a5e79814 Auto merge of #95159 - nnethercote:TtParser, r=petrochenkov
Introduce `TtParser`

These commits make a number of changes to declarative macro expansion, resulting in code that is shorter, simpler, and faster.

Best reviewed one commit at a time.

r? `@petrochenkov`
2022-03-22 21:46:57 +00:00
..
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