(command.CommandList
  children: [
    (command.Simple
      blame_tok: <source>
      more_env: []
      words: [{<source>} {<'build/common.sh'>}]
      redirects: []
      do_fork: T
    )
    (command.Simple
      blame_tok: <export>
      more_env: []
      words: [{<export>} {<Id.Lit_VarLike 'CC='> ($ Id.VSub_DollarName CLANG)}]
      redirects: []
      do_fork: T
    )
  ]
)