Preparatory changes for macro parsing BFS->DFS#158974

Merged

rust-bors[bot] merged 12 commits into

rust-lang:mainfrom

bal-e:macro-parsing-dfs-prep

Jul 12, 2026

Commits on Jul 10, 2026

Minor fixups related to ambiguity errors
arya dradjica
committed
Move `WhichMatcher` param to `after_arm()` into tracker state
arya dradjica
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Move failure handling out of `after_arm()`
arya dradjica
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Remove data from `ParseResult::Failure` and remove `Tracker::Failure`
arya dradjica
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Only pass a `Parser` to `Tracker::failure()`
arya dradjica
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Simplify failure message computation
arya dradjica
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Remove incorrect comment on `can_begin_pattern()`
arya dradjica
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Ensure that no mps are left over on EOF
arya dradjica
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Disallow EOF in `nonterminal_may_begin_with()`
arya dradjica
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Test that all meta-variables respond to EOF in the same way
arya dradjica
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Use `Rc::unwrap_or_clone()` to extract matches
arya dradjica
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Factor out `MatcherPos` matching into a subroutine
arya dradjica
committed