SOURCE_FILE@0..52
  FN_DEF@0..51
    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..51
      L_CURLY@9..10 "{"
      WHITESPACE@10..15 "\n    "
      LET_STMT@15..26
        LET_KW@15..18 "let"
        WHITESPACE@18..19 " "
        PLACEHOLDER_PAT@19..20
          UNDERSCORE@19..20 "_"
        WHITESPACE@20..21 " "
        EQ@21..22 "="
        WHITESPACE@22..23 " "
        REF_EXPR@23..25
          AMP@23..24 "&"
          LITERAL@24..25
            INT_NUMBER@24..25 "1"
        SEMICOLON@25..26 ";"
      WHITESPACE@26..31 "\n    "
      LET_STMT@31..49
        LET_KW@31..34 "let"
        WHITESPACE@34..35 " "
        PLACEHOLDER_PAT@35..36
          UNDERSCORE@35..36 "_"
        WHITESPACE@36..37 " "
        EQ@37..38 "="
        WHITESPACE@38..39 " "
        REF_EXPR@39..48
          AMP@39..40 "&"
          MUT_KW@40..43 "mut"
          WHITESPACE@43..44 " "
          REF_EXPR@44..48
            AMP@44..45 "&"
            CALL_EXPR@45..48
              PATH_EXPR@45..46
                PATH@45..46
                  PATH_SEGMENT@45..46
                    NAME_REF@45..46
                      IDENT@45..46 "f"
              ARG_LIST@46..48
                L_PAREN@46..47 "("
                R_PAREN@47..48 ")"
        SEMICOLON@48..49 ";"
      WHITESPACE@49..50 "\n"
      R_CURLY@50..51 "}"
  WHITESPACE@51..52 "\n"