(command.AndOr
  ops: [Id.Op_DAmp]
  children: [
    (C {<cd>} {<'build/system-image-'> (DQ ($ Id.VSub_Number '$1'))})
    (command.Simple
      words: [{<'./dev-environment.sh'>}]
      more_env: [
        (env_pair
          name: PATH
          val: 
            {
              (DQ (command_sub left_token:<Id.Left_DollarParen '$('> child:(C {<pwd>})) 
                <'/build/host:'> ($ Id.VSub_DollarName '$PATH')
              )
            }
          spids: [21]
        )
      ]
      do_fork: T
    )
  ]
)