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        "column" : 8,
        "source_fragment" : "update_checksum(hdr.ipv4.isValid(), ..."
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        "source_fragment" : "verify_checksum(hdr.ipv4.isValid(), ..."
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    [
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      ["standard_metadata", "egress_global_timestamp"]
    ],
    [
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      ["standard_metadata", "lf_field_list"]
    ],
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      ["standard_metadata", "mcast_grp"]
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  "program" : "fabric.p4",
  "__meta__" : {
    "version" : [2, 18],
    "compiler" : "https://github.com/p4lang/p4c"
  }
}