oil AST

(command.CommandList
  children: [
    (C {(echo)} {(DQ ('Content-type: text/html'))})
    (C {(echo)} {(DQ )})
    (C {(echo)} 
      {
        (DQ ('<html><body bgcolor=') 
          (word_part.EscapedLiteral
            token: (Token id:Id.Lit_EscapedChar val:'\\"' span_id:31)
          ) (white) (word_part.EscapedLiteral token:(Token id:Id.Lit_EscapedChar val:'\\"' span_id:33)) 
          ('><h2>CGI Runtime Environment</h2>')
        )
      }
    )
    (C {(echo)} {(DQ ('<pre>'))})
    (command.AndOr ops:[Id.Op_DPipe] children:[(C {(env)}) (C {(printenv)})])
    (C {(echo)} {(DQ ('</pre>'))})
    (C {(echo)} {(DQ ('<h3>Input stream is:</h3>'))})
    (C {(echo)} {(DQ ('<pre>'))})
    (C {(cat)} {(-)})
    (C {(echo)} {(DQ ('(end of input stream)</pre></body></html>'))})
    (command.ControlFlow token:(Token id:Id.ControlFlow_Exit val:exit span_id:78) arg_word:{(0)})
  ]
)