SOURCE_FILE@0..282
  FN@0..281
    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..281
      STMT_LIST@9..281
        L_CURLY@9..10 "{"
        WHITESPACE@10..15 "\n    "
        CONST@15..42
          CONST_KW@15..20 "const"
          WHITESPACE@20..21 " "
          UNDERSCORE@21..22 "_"
          COLON@22..23 ":"
          WHITESPACE@23..24 " "
          TUPLE_TYPE@24..26
            L_PAREN@24..25 "("
            R_PAREN@25..26 ")"
          WHITESPACE@26..27 " "
          EQ@27..28 "="
          WHITESPACE@28..29 " "
          LET_EXPR@29..41
            LET_KW@29..32 "let"
            WHITESPACE@32..33 " "
            WILDCARD_PAT@33..34
              UNDERSCORE@33..34 "_"
            WHITESPACE@34..35 " "
            EQ@35..36 "="
            WHITESPACE@36..37 " "
            PATH_EXPR@37..41
              PATH@37..41
                PATH_SEGMENT@37..41
                  NAME_REF@37..41
                    IDENT@37..41 "None"
          SEMICOLON@41..42 ";"
        WHITESPACE@42..48 "\n\n    "
        LET_STMT@48..83
          LET_KW@48..51 "let"
          WHITESPACE@51..52 " "
          WILDCARD_PAT@52..53
            UNDERSCORE@52..53 "_"
          WHITESPACE@53..54 " "
          EQ@54..55 "="
          WHITESPACE@55..56 " "
          IF_EXPR@56..82
            IF_KW@56..58 "if"
            WHITESPACE@58..59 " "
            LITERAL@59..63
              TRUE_KW@59..63 "true"
            WHITESPACE@63..64 " "
            BLOCK_EXPR@64..82
              STMT_LIST@64..82
                L_CURLY@64..65 "{"
                WHITESPACE@65..66 " "
                PAREN_EXPR@66..80
                  L_PAREN@66..67 "("
                  LET_EXPR@67..79
                    LET_KW@67..70 "let"
                    WHITESPACE@70..71 " "
                    WILDCARD_PAT@71..72
                      UNDERSCORE@71..72 "_"
                    WHITESPACE@72..73 " "
                    EQ@73..74 "="
                    WHITESPACE@74..75 " "
                    PATH_EXPR@75..79
                      PATH@75..79
                        PATH_SEGMENT@75..79
                          NAME_REF@75..79
                            IDENT@75..79 "None"
                  R_PAREN@79..80 ")"
                WHITESPACE@80..81 " "
                R_CURLY@81..82 "}"
          SEMICOLON@82..83 ";"
        WHITESPACE@83..89 "\n\n    "
        IF_EXPR@89..279
          IF_KW@89..91 "if"
          WHITESPACE@91..92 " "
          BIN_EXPR@92..114
            LITERAL@92..96
              TRUE_KW@92..96 "true"
            WHITESPACE@96..97 " "
            AMP2@97..99 "&&"
            WHITESPACE@99..100 " "
            PAREN_EXPR@100..114
              L_PAREN@100..101 "("
              LET_EXPR@101..113
                LET_KW@101..104 "let"
                WHITESPACE@104..105 " "
                WILDCARD_PAT@105..106
                  UNDERSCORE@105..106 "_"
                WHITESPACE@106..107 " "
                EQ@107..108 "="
                WHITESPACE@108..109 " "
                PATH_EXPR@109..113
                  PATH@109..113
                    PATH_SEGMENT@109..113
                      NAME_REF@109..113
                        IDENT@109..113 "None"
              R_PAREN@113..114 ")"
          WHITESPACE@114..115 " "
          BLOCK_EXPR@115..279
            STMT_LIST@115..279
              L_CURLY@115..116 "{"
              WHITESPACE@116..125 "\n        "
              EXPR_STMT@125..140
                PAREN_EXPR@125..139
                  L_PAREN@125..126 "("
                  LET_EXPR@126..138
                    LET_KW@126..129 "let"
                    WHITESPACE@129..130 " "
                    WILDCARD_PAT@130..131
                      UNDERSCORE@130..131 "_"
                    WHITESPACE@131..132 " "
                    EQ@132..133 "="
                    WHITESPACE@133..134 " "
                    PATH_EXPR@134..138
                      PATH@134..138
                        PATH_SEGMENT@134..138
                          NAME_REF@134..138
                            IDENT@134..138 "None"
                  R_PAREN@138..139 ")"
                SEMICOLON@139..140 ";"
              WHITESPACE@140..149 "\n        "
              WHILE_EXPR@149..273
                WHILE_KW@149..154 "while"
                WHITESPACE@154..155 " "
                LET_EXPR@155..167
                  LET_KW@155..158 "let"
                  WHITESPACE@158..159 " "
                  WILDCARD_PAT@159..160
                    UNDERSCORE@159..160 "_"
                  WHITESPACE@160..161 " "
                  EQ@161..162 "="
                  WHITESPACE@162..163 " "
                  PATH_EXPR@163..167
                    PATH@163..167
                      PATH_SEGMENT@163..167
                        NAME_REF@163..167
                          IDENT@163..167 "None"
                WHITESPACE@167..168 " "
                BLOCK_EXPR@168..273
                  STMT_LIST@168..273
                    L_CURLY@168..169 "{"
                    WHITESPACE@169..182 "\n            "
                    MATCH_EXPR@182..263
                      MATCH_KW@182..187 "match"
                      WHITESPACE@187..188 " "
                      PATH_EXPR@188..192
                        PATH@188..192
                          PATH_SEGMENT@188..192
                            NAME_REF@188..192
                              IDENT@188..192 "None"
                      WHITESPACE@192..193 " "
                      MATCH_ARM_LIST@193..263
                        L_CURLY@193..194 "{"
                        WHITESPACE@194..211 "\n                "
                        MATCH_ARM@211..249
                          WILDCARD_PAT@211..212
                            UNDERSCORE@211..212 "_"
                          WHITESPACE@212..213 " "
                          MATCH_GUARD@213..228
                            IF_KW@213..215 "if"
                            WHITESPACE@215..216 " "
                            LET_EXPR@216..228
                              LET_KW@216..219 "let"
                              WHITESPACE@219..220 " "
                              WILDCARD_PAT@220..221
                                UNDERSCORE@220..221 "_"
                              WHITESPACE@221..222 " "
                              EQ@222..223 "="
                              WHITESPACE@223..224 " "
                              PATH_EXPR@224..228
                                PATH@224..228
                                  PATH_SEGMENT@224..228
                                    NAME_REF@224..228
                                      IDENT@224..228 "None"
                          WHITESPACE@228..229 " "
                          FAT_ARROW@229..231 "=>"
                          WHITESPACE@231..232 " "
                          BLOCK_EXPR@232..249
                            STMT_LIST@232..249
                              L_CURLY@232..233 "{"
                              WHITESPACE@233..234 " "
                              LET_STMT@234..247
                                LET_KW@234..237 "let"
                                WHITESPACE@237..238 " "
                                WILDCARD_PAT@238..239
                                  UNDERSCORE@238..239 "_"
                                WHITESPACE@239..240 " "
                                EQ@240..241 "="
                                WHITESPACE@241..242 " "
                                PATH_EXPR@242..246
                                  PATH@242..246
                                    PATH_SEGMENT@242..246
                                      NAME_REF@242..246
                                        IDENT@242..246 "None"
                                SEMICOLON@246..247 ";"
                              WHITESPACE@247..248 " "
                              R_CURLY@248..249 "}"
                        WHITESPACE@249..262 "\n            "
                        R_CURLY@262..263 "}"
                    WHITESPACE@263..272 "\n        "
                    R_CURLY@272..273 "}"
              WHITESPACE@273..278 "\n    "
              R_CURLY@278..279 "}"
        WHITESPACE@279..280 "\n"
        R_CURLY@280..281 "}"
  WHITESPACE@281..282 "\n"
error 29..41: `let` expressions are not supported here
error 67..79: `let` expressions are not supported here
error 126..138: `let` expressions are not supported here