SOURCE_FILE
  FN
    FN_KW "fn"
    WHITESPACE " "
    NAME
      IDENT "f"
    PARAM_LIST
      L_PAREN "("
      R_PAREN ")"
    WHITESPACE " "
    BLOCK_EXPR
      STMT_LIST
        L_CURLY "{"
        WHITESPACE "\n    "
        LET_STMT
          LET_KW "let"
          WHITESPACE " "
          RANGE_PAT
            LITERAL_PAT
              LITERAL
                INT_NUMBER "0"
            WHITESPACE " "
            DOT2 ".."
          WHITESPACE " "
          EQ "="
          WHITESPACE " "
          LITERAL
            INT_NUMBER "1u32"
          SEMICOLON ";"
        WHITESPACE "\n    "
        LET_STMT
          LET_KW "let"
          WHITESPACE " "
          RANGE_PAT
            LITERAL_PAT
              LITERAL
                INT_NUMBER "0"
            DOT2 ".."
          COLON ":"
          WHITESPACE " "
          INFER_TYPE
            UNDERSCORE "_"
          WHITESPACE " "
          EQ "="
          WHITESPACE " "
          LITERAL
            INT_NUMBER "1u32"
          SEMICOLON ";"
        WHITESPACE "\n\n    "
        MATCH_EXPR
          MATCH_KW "match"
          WHITESPACE " "
          LITERAL
            INT_NUMBER "42"
          WHITESPACE " "
          MATCH_ARM_LIST
            L_CURLY "{"
            WHITESPACE "\n        "
            MATCH_ARM
              RANGE_PAT
                LITERAL_PAT
                  LITERAL
                    INT_NUMBER "0"
                WHITESPACE " "
                DOT2 ".."
              WHITESPACE " "
              MATCH_GUARD
                IF_KW "if"
                WHITESPACE " "
                LITERAL
                  TRUE_KW "true"
              WHITESPACE " "
              FAT_ARROW "=>"
              WHITESPACE " "
              TUPLE_EXPR
                L_PAREN "("
                R_PAREN ")"
              COMMA ","
            WHITESPACE "\n        "
            MATCH_ARM
              WILDCARD_PAT
                UNDERSCORE "_"
              WHITESPACE " "
              FAT_ARROW "=>"
              WHITESPACE " "
              TUPLE_EXPR
                L_PAREN "("
                R_PAREN ")"
              COMMA ","
            WHITESPACE "\n    "
            R_CURLY "}"
        WHITESPACE "\n"
        R_CURLY "}"
  WHITESPACE "\n"
