{"ast_node_type":"other","tokens":[{"end":63,"kind":"keyword","start":0,"text":"|&mappings::BranchPair"}]}
        |&mappings::BranchPair { span, true_bcb, false_bcb }| {
    mappings.extend(branch_pairs.iter().map(
            let kind = MappingKind::Branch { true_bcb, false_bcb };