(command.CommandList
  children: [
    (C {<atf_test_case>} {<nonexistent>})
    (command.ShFunction
      name: nonexistent_head
      body: 
        (BraceGroup
          children: [
            (C {<atf_set>} {(DQ <descr>)} {(DQ <'Check ifconfig(8) with '>)} 
              {(DQ <'a nonexistent interface (PR bin/43141)'>)}
            )
          ]
        )
    )
    (command.ShFunction
      name: nonexistent_body
      body: 
        (BraceGroup
          children: [
            (C {<atf_check>} {<-s>} {<not-exit> <Id.Lit_Colon ':'> <0>} {<-e>} {<ignore>} {<ifconfig>} 
              {<nonexistent0>} {<'1.2.3.4/24'>}
            )
          ]
        )
    )
    (command.ShFunction
      name: atf_init_test_cases
      body: (BraceGroup children:[(C {<atf_add_test_case>} {<nonexistent>})])
    )
  ]
)