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..15 "\n    "
      EXPR_STMT@15..18
        TRY_EXPR@15..17
          PATH_EXPR@15..16
            PATH@15..16
              PATH_SEGMENT@15..16
                NAME_REF@15..16
                  IDENT@15..16 "x"
          QUESTION@16..17 "?"
        SEMICOLON@17..18 ";"
      WHITESPACE@18..19 "\n"
      R_CURLY@19..20 "}"
  WHITESPACE@20..21 "\n"