(command.AndOr
  ops: [Id.Op_DAmp]
  children: [
    (command.ShFunction
      name: _interdiff
      body: 
        (command.BraceGroup
          children: [
            (C {<local>} {<cur>} {<prev>} {<words>} {<cword>} {<split>})
            (command.AndOr
              ops: [Id.Op_DPipe]
              children: [
                (C {<_init_completion>} {<-s>})
                (command.ControlFlow token:<Id.ControlFlow_Return return>)
              ]
            )
            (command.Case
              to_match: {($ Id.VSub_DollarName '$prev')}
              arms: [
                (case_arm
                  pat_list: [{<-U>} {<--unified>} {<-p>} {<--strip-match>} {<-d>} {<--drop-context>}]
                  action: [(command.ControlFlow token:<Id.ControlFlow_Return return>)]
                  spids: [41 52 58 -1]
                )
              ]
            )
            (command.AndOr
              ops: [Id.Op_DAmp]
              children: [
                (C {($ Id.VSub_DollarName '$split')})
                (command.ControlFlow token:<Id.ControlFlow_Return return>)
              ]
            )
            (command.If
              arms: [
                (if_arm
                  cond: [
                    (command.Sentence
                      child: 
                        (command.DBracket
                          expr: 
                            (bool_expr.Binary
                              op_id: Id.BoolBinary_GlobDEqual
                              left: {($ Id.VSub_DollarName '$cur')}
                              right: {<-> <Id.Lit_Other '*'>}
                            )
                        )
                      terminator: <Id.Op_Semi _>
                    )
                  ]
                  action: [
                    (command.ShAssignment
                      pairs: [
                        (assign_pair
                          lhs: (sh_lhs_expr.Name name:COMPREPLY)
                          op: assign_op.Equal
                          rhs: 
                            {
                              (sh_array_literal
                                left: <Id.Op_LParen _>
                                words: [
                                  {
                                    (command_sub
                                      left_token: <Id.Left_DollarParen '$('>
                                      command_list: 
                                        (command.CommandList
                                          children: [
                                            (C {<compgen>} {<-W>} {(SQ <'$( _parse_help "$1" )'>)} {<-->} 
                                              {(DQ ($ Id.VSub_DollarName '$cur'))}
                                            )
                                          ]
                                        )
                                    )
                                  }
                                ]
                              )
                            }
                          spids: [90]
                        )
                      ]
                    )
                    (command.AndOr
                      ops: [Id.Op_DAmp]
                      children: [
                        (command.DBracket
                          expr: 
                            (bool_expr.Binary
                              op_id: Id.BoolBinary_GlobDEqual
                              left: {($ Id.VSub_DollarName '$COMPREPLY')}
                              right: {<Id.Lit_Other '*'> <Id.BoolBinary_GlobEqual '='>}
                            )
                        )
                        (C {<compopt>} {<-o>} {<nospace>})
                      ]
                    )
                    (command.ControlFlow token:<Id.ControlFlow_Return return>)
                  ]
                  spids: [73 87]
                )
              ]
            )
            (C {<local>} {<Id.Lit_VarLike 'exts='> (SQ <'@(?(d)patch|dif?(f))'>)} {<word>})
            (command.ForEach
              iter_name: word
              iter_words: [
                {
                  (braced_var_sub
                    token: <Id.VSub_Name words>
                    bracket_op: (bracket_op.WholeArray op_id:Id.Lit_At)
                  )
                }
              ]
              do_arg_iter: F
              body: 
                (command.DoGroup
                  children: [
                    (command.If
                      arms: [
                        (if_arm
                          cond: [
                            (command.Sentence
                              child: 
                                (command.DBracket
                                  expr: 
                                    (bool_expr.Binary
                                      op_id: Id.BoolBinary_GlobDEqual
                                      left: {($ Id.VSub_DollarName '$word')}
                                      right: 
                                        {<-> 
                                          (word_part.ExtGlob
                                            op: <Id.ExtGlob_At '@('>
                                            arms: [{<z>} {<-decompress>}]
                                          )
                                        }
                                    )
                                )
                              terminator: <Id.Op_Semi _>
                            )
                          ]
                          action: [
                            (command.ShAssignment
                              pairs: [
                                (assign_pair
                                  lhs: (sh_lhs_expr.Name name:exts)
                                  op: assign_op.PlusEqual
                                  rhs: {(SQ <'?(.@(gz|bz2))'>)}
                                  spids: [189]
                                )
                              ]
                            )
                            (command.ControlFlow
                              token: <Id.ControlFlow_Break break>
                            )
                          ]
                          spids: [168 186]
                        )
                      ]
                    )
                  ]
                )
            )
            (C {<_filedir>} {(DQ ($ Id.VSub_DollarName '$exts'))})
          ]
        )
    )
    (C {<complete>} {<-F>} {<_interdiff>} {<interdiff>})
  ]
)