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When a field pattern has a bare capture with no preceding pattern atom (i.e. `foo: @bar`), implicitly use a true wildcard (`_`, match_unnamed: true) as the node pattern, making it equivalent to `foo: _ @bar`. This is a convenience shorthand: in practice every `field: _ @cap` in the Swift rules can now be written more concisely as `field: @cap`. Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>