SOURCE_FILE@0..21
  FN@0..20
    FN_KW@0..2 "fn"
    WHITESPACE@2..3 " "
    NAME@3..6
      IDENT@3..6 "foo"
    PARAM_LIST@6..8
      L_PAREN@6..7 "("
      R_PAREN@7..8 ")"
    WHITESPACE@8..9 " "
    BLOCK_EXPR@9..20
      L_CURLY@9..10 "{"
      WHITESPACE@10..11 " "
      EXPR_STMT@11..18
        INDEX_EXPR@11..17
          PATH_EXPR@11..13
            PATH@11..13
              PATH_SEGMENT@11..13
                NAME_REF@11..13
                  IDENT@11..13 "xs"
          L_BRACK@13..14 "["
          RANGE_EXPR@14..16
            DOT2@14..16 ".."
          R_BRACK@16..17 "]"
        SEMICOLON@17..18 ";"
      WHITESPACE@18..19 " "
      R_CURLY@19..20 "}"
  WHITESPACE@20..21 "\n"