oil AST

(command.CommandList
  children: [
    (command.AndOr
      ops: [Id.Op_DAmp]
      children: [
        (C {<Id.Lit_LBracket '['>} {<-z>} {(DQ ($ Id.VSub_DollarName '$TEST_SRCDIR'))} 
          {<Id.Lit_RBracket ']'>}
        )
        (BraceGroup
          children: [
            (command.Sentence
              child: 
                (command.Simple
                  words: [{<echo>} {(DQ <'TEST_SRCDIR not set!'>)}]
                  redirects: [(redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
                  do_fork: T
                )
              terminator: <Id.Op_Semi _>
            )
            (command.Sentence
              child: (command.ControlFlow token:<Id.ControlFlow_Exit exit> arg_word:{<1>})
              terminator: <Id.Op_Semi _>
            )
          ]
        )
      ]
    )
    (command.AndOr
      ops: [Id.Op_DPipe]
      children: [
        (C {<source>} {(DQ (${ Id.VSub_Name TEST_SRCDIR) <'/io_bazel/src/test/shell/unittest.bash'>)})
        (BraceGroup
          children: [
            (command.Sentence
              child: 
                (command.Simple
                  words: [{<echo>} {(DQ <'Failed to source unittest.bash'>)}]
                  redirects: [(redir op:<Id.Redir_GreatAnd '>&'> loc:(redir_loc.Fd fd:1) arg:{<2>})]
                  do_fork: T
                )
              terminator: <Id.Op_Semi _>
            )
            (command.Sentence
              child: (command.ControlFlow token:<Id.ControlFlow_Exit exit> arg_word:{<1>})
              terminator: <Id.Op_Semi _>
            )
          ]
        )
      ]
    )
    (C {<Id.Lit_Colon ':'>} 
      {
        (braced_var_sub
          token: <Id.VSub_Name MASTER_COMMIT>
          suffix_op: 
            (suffix_op.Unary
              tok: <Id.VTest_ColonEquals ':='>
              arg_word: {<7d41d7417fc34f7fa8aac7130a0588b8557e4b57>}
            )
        )
      }
    )
    (command.ShFunction
      name: setup_git_repository
      body: 
        (BraceGroup
          children: [
            (C {<local>} 
              {<Id.Lit_VarLike 'origin_git_root='> (${ Id.VSub_Name TEST_SRCDIR) <'/io_bazel'>}
            )
            (command.ShAssignment
              pairs: [
                (assign_pair
                  lhs: (sh_lhs_expr.Name name:MASTER_ROOT)
                  op: assign_op.Equal
                  rhs: {(${ Id.VSub_Name TEST_TMPDIR) <'/git/root'>}
                  spids: [157]
                )
              ]
            )
            (C {<local>} {<Id.Lit_VarLike 'orig_dir='> (${ Id.VSub_Name PWD)})
            (C {<mkdir>} {<-p>} {(${ Id.VSub_Name MASTER_ROOT)})
            (C {<cd>} {(${ Id.VSub_Name MASTER_ROOT)})
            (C {<cp>} {<-RL>} {(${ Id.VSub_Name origin_git_root) <'/.git'>} {<.git>})
            (C {<rm>} {<-f>} {<'.git/hooks/'> <Id.Lit_Star '*'>})
            (C {<git>} {<reset>} {<-q>} {<--hard>} {<HEAD>})
            (C {<git>} {<checkout>} {<-q>} {<-B>} {<master>} {(${ Id.VSub_Name MASTER_COMMIT)})
            (C {<cd>} {(${ Id.VSub_Name orig_dir)})
          ]
        )
    )
  ]
)