(command.CommandList
  children: [
    (C {(KW_Set set)} {(-e)})
    (C {(git)} {(log)} {(--grep) (Lit_Equals '=') (SQ <'^ARROW-[0-9]*:.*'>)} {(-n1)} 
      {(--pretty) (Lit_Equals '=') (format) (Lit_Other ':') (Lit_Other '%') (H)}
    )
  ]
)