{"ast_node_type":"other","tokens":[{"end":55,"kind":"keyword","start":0,"text":"column:"}]}
    column: &PatternColumn<'p, RustcPatCtxt<'p, 'tcx>>,
    cx: &RustcPatCtxt<'p, 'tcx>,
) -> Result<Vec<WitnessPat<'p, 'tcx>>, ErrorGuaranteed> {