SOURCE_FILE
  USE
    USE_KW "use"
    WHITESPACE " "
    USE_TREE
      PATH
        PATH_SEGMENT
          NAME_REF
            IDENT "std"
      COLON2 "::"
      USE_TREE_LIST
        L_CURLY "{"
        USE_TREE
          PATH
            PATH_SEGMENT
              NAME_REF
                IDENT "collections"
        R_CURLY "}"
    SEMICOLON ";"
  WHITESPACE "\n"
