SOURCE_FILE
  USE
    USE_KW "use"
    WHITESPACE " "
    USE_TREE
      PATH
        PATH_SEGMENT
          COLON2 "::"
          NAME_REF
            IDENT "std"
    SEMICOLON ";"
  WHITESPACE "\n"
  USE
    USE_KW "use"
    WHITESPACE " "
    USE_TREE
      PATH
        PATH
          PATH_SEGMENT
            NAME_REF
              IDENT "std"
        COLON2 "::"
        PATH_SEGMENT
          NAME_REF
            IDENT "collections"
    SEMICOLON ";"
  WHITESPACE "\n\n"
  USE
    USE_KW "use"
    WHITESPACE " "
    USE_TREE
      PATH
        PATH
          PATH_SEGMENT
            NAME_REF
              SELF_KW "self"
        COLON2 "::"
        PATH_SEGMENT
          NAME_REF
            IDENT "m"
    SEMICOLON ";"
  WHITESPACE "\n"
  USE
    USE_KW "use"
    WHITESPACE " "
    USE_TREE
      PATH
        PATH
          PATH_SEGMENT
            NAME_REF
              SUPER_KW "super"
        COLON2 "::"
        PATH_SEGMENT
          NAME_REF
            IDENT "m"
    SEMICOLON ";"
  WHITESPACE "\n"
  USE
    USE_KW "use"
    WHITESPACE " "
    USE_TREE
      PATH
        PATH
          PATH_SEGMENT
            NAME_REF
              CRATE_KW "crate"
        COLON2 "::"
        PATH_SEGMENT
          NAME_REF
            IDENT "m"
    SEMICOLON ";"
  WHITESPACE "\n"
