oil AST

(command.CommandList
  children: [
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:test_description)
          op: assign_op.Equal
          rhs: {(SQ <'revert can handle submodules'>)}
          spids: [4]
        )
      ]
    )
    (C {<.>} {<'./test-lib.sh'>})
    (C {<.>} {(DQ ($ Id.VSub_DollarName '$TEST_DIRECTORY')) <'/lib-submodule-update.sh'>})
    (command.ShFunction
      name: git_revert
      body: 
        (BraceGroup
          children: [
            (command.AndOr
              ops: [
                Id.Op_DAmp
                Id.Op_DAmp
                Id.Op_DAmp
                Id.Op_DAmp
                Id.Op_DAmp
                Id.Op_DAmp
                Id.Op_DAmp
                Id.Op_DAmp
                Id.Op_DAmp
                Id.Op_DAmp
              ]
              children: [
                (command.Simple
                  words: [{<git>} {<status>} {<-su>}]
                  redirects: [(redir op:<Id.Redir_Great '>'> loc:(redir_loc.Fd fd:1) arg:{<expect>})]
                  do_fork: T
                )
                (command.Simple
                  words: [{<ls>} {<-1pR>} {<Id.Lit_Star '*'>}]
                  redirects: [(redir op:<Id.Redir_DGreat '>>'> loc:(redir_loc.Fd fd:1) arg:{<expect>})]
                  do_fork: T
                )
                (C {<tar>} {<cf>} {(DQ ($ Id.VSub_DollarName '$TRASH_DIRECTORY') <'/tmp.tar'>)} 
                  {<Id.Lit_Star '*'>}
                )
                (C {<git>} {<checkout>} {(DQ ($ Id.VSub_Number '$1'))})
                (C {<git>} {<revert>} {<HEAD>})
                (C {<rm>} {<-rf>} {<Id.Lit_Star '*'>})
                (C {<tar>} {<xf>} {(DQ ($ Id.VSub_DollarName '$TRASH_DIRECTORY') <'/tmp.tar'>)})
                (command.Simple
                  words: [{<git>} {<status>} {<-su>}]
                  redirects: [(redir op:<Id.Redir_Great '>'> loc:(redir_loc.Fd fd:1) arg:{<actual>})]
                  do_fork: T
                )
                (command.Simple
                  words: [{<ls>} {<-1pR>} {<Id.Lit_Star '*'>}]
                  redirects: [(redir op:<Id.Redir_DGreat '>>'> loc:(redir_loc.Fd fd:1) arg:{<actual>})]
                  do_fork: T
                )
                (C {<test_cmp>} {<expect>} {<actual>})
                (C {<git>} {<revert>} {<HEAD>})
              ]
            )
          ]
        )
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:KNOWN_FAILURE_CHERRY_PICK_SEES_EMPTY_COMMIT)
          op: assign_op.Equal
          rhs: {<1>}
          spids: [169]
        )
      ]
    )
    (command.ShAssignment
      pairs: [
        (assign_pair
          lhs: (sh_lhs_expr.Name name:KNOWN_FAILURE_NOFF_MERGE_DOESNT_CREATE_EMPTY_SUBMODULE_DIR)
          op: assign_op.Equal
          rhs: {<1>}
          spids: [172]
        )
      ]
    )
    (C {<test_submodule_switch>} {(DQ <git_revert>)})
    (C {<test_done>})
  ]
)