SOURCE_FILE@0..23
  FN@0..22
    ATTR@0..10
      POUND@0..1 "#"
      L_BRACK@1..2 "["
      META@2..9
        PATH@2..5
          PATH_SEGMENT@2..5
            NAME_REF@2..5
              IDENT@2..5 "foo"
        TOKEN_TREE@5..9
          L_PAREN@5..6 "("
          IDENT@6..7 "a"
          COMMA@7..8 ","
          R_PAREN@8..9 ")"
      R_BRACK@9..10 "]"
    WHITESPACE@10..11 "\n"
    FN_KW@11..13 "fn"
    WHITESPACE@13..14 " "
    NAME@14..17
      IDENT@14..17 "foo"
    PARAM_LIST@17..19
      L_PAREN@17..18 "("
      R_PAREN@18..19 ")"
    WHITESPACE@19..20 " "
    BLOCK_EXPR@20..22
      L_CURLY@20..21 "{"
      R_CURLY@21..22 "}"
  WHITESPACE@22..23 "\n"