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parse_tt refactorings#94798

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Mar 12, 2022

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Commits on Mar 11, 2022

• Refactor the second half of `parse_tt`.

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• Disallow `TokenTree::{MetaVar,MetaVarExpr}` in matchers.

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• Add a useful assertion.

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• Move `eof_items` handling entirely within `inner_parse_loop`.

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• Make next_items a `SmallVec`.

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• Move a `parse_tt` error case into a separate function.

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