SOURCE_FILE
  FN
    FN_KW "fn"
    WHITESPACE " "
    NAME
      IDENT "foo"
    PARAM_LIST
      L_PAREN "("
      R_PAREN ")"
    WHITESPACE " "
    BLOCK_EXPR
      STMT_LIST
        L_CURLY "{"
        WHITESPACE " "
        IF_EXPR
          IF_KW "if"
          WHITESPACE " "
          CONDITION
            LET_KW "let"
            WHITESPACE " "
            TUPLE_STRUCT_PAT
              PATH
                PATH_SEGMENT
                  NAME_REF
                    IDENT "Some"
              L_PAREN "("
              WILDCARD_PAT
                UNDERSCORE "_"
              R_PAREN ")"
            WHITESPACE " "
            EQ "="
            WHITESPACE " "
            PATH_EXPR
              PATH
                PATH_SEGMENT
                  NAME_REF
                    IDENT "None"
          WHITESPACE " "
          BLOCK_EXPR
            STMT_LIST
              L_CURLY "{"
              R_CURLY "}"
        WHITESPACE " "
        R_CURLY "}"
  WHITESPACE "\n"
  FN
    FN_KW "fn"
    WHITESPACE " "
    NAME
      IDENT "bar"
    PARAM_LIST
      L_PAREN "("
      R_PAREN ")"
    WHITESPACE " "
    BLOCK_EXPR
      STMT_LIST
        L_CURLY "{"
        WHITESPACE "\n    "
        EXPR_STMT
          IF_EXPR
            IF_KW "if"
            WHITESPACE " "
            CONDITION
              LET_KW "let"
              WHITESPACE " "
              OR_PAT
                TUPLE_STRUCT_PAT
                  PATH
                    PATH_SEGMENT
                      NAME_REF
                        IDENT "Some"
                  L_PAREN "("
                  WILDCARD_PAT
                    UNDERSCORE "_"
                  R_PAREN ")"
                WHITESPACE " "
                PIPE "|"
                WHITESPACE " "
                TUPLE_STRUCT_PAT
                  PATH
                    PATH_SEGMENT
                      NAME_REF
                        IDENT "Some"
                  L_PAREN "("
                  WILDCARD_PAT
                    UNDERSCORE "_"
                  R_PAREN ")"
              WHITESPACE " "
              EQ "="
              WHITESPACE " "
              PATH_EXPR
                PATH
                  PATH_SEGMENT
                    NAME_REF
                      IDENT "None"
            WHITESPACE " "
            BLOCK_EXPR
              STMT_LIST
                L_CURLY "{"
                R_CURLY "}"
        WHITESPACE "\n    "
        EXPR_STMT
          IF_EXPR
            IF_KW "if"
            WHITESPACE " "
            CONDITION
              LET_KW "let"
              WHITESPACE " "
              PIPE "|"
              WHITESPACE " "
              TUPLE_STRUCT_PAT
                PATH
                  PATH_SEGMENT
                    NAME_REF
                      IDENT "Some"
                L_PAREN "("
                WILDCARD_PAT
                  UNDERSCORE "_"
                R_PAREN ")"
              WHITESPACE " "
              EQ "="
              WHITESPACE " "
              PATH_EXPR
                PATH
                  PATH_SEGMENT
                    NAME_REF
                      IDENT "None"
            WHITESPACE " "
            BLOCK_EXPR
              STMT_LIST
                L_CURLY "{"
                R_CURLY "}"
        WHITESPACE "\n    "
        EXPR_STMT
          WHILE_EXPR
            WHILE_KW "while"
            WHITESPACE " "
            CONDITION
              LET_KW "let"
              WHITESPACE " "
              OR_PAT
                TUPLE_STRUCT_PAT
                  PATH
                    PATH_SEGMENT
                      NAME_REF
                        IDENT "Some"
                  L_PAREN "("
                  WILDCARD_PAT
                    UNDERSCORE "_"
                  R_PAREN ")"
                WHITESPACE " "
                PIPE "|"
                WHITESPACE " "
                TUPLE_STRUCT_PAT
                  PATH
                    PATH_SEGMENT
                      NAME_REF
                        IDENT "Some"
                  L_PAREN "("
                  WILDCARD_PAT
                    UNDERSCORE "_"
                  R_PAREN ")"
              WHITESPACE " "
              EQ "="
              WHITESPACE " "
              PATH_EXPR
                PATH
                  PATH_SEGMENT
                    NAME_REF
                      IDENT "None"
            WHITESPACE " "
            BLOCK_EXPR
              STMT_LIST
                L_CURLY "{"
                R_CURLY "}"
        WHITESPACE "\n    "
        WHILE_EXPR
          WHILE_KW "while"
          WHITESPACE " "
          CONDITION
            LET_KW "let"
            WHITESPACE " "
            PIPE "|"
            WHITESPACE " "
            TUPLE_STRUCT_PAT
              PATH
                PATH_SEGMENT
                  NAME_REF
                    IDENT "Some"
              L_PAREN "("
              WILDCARD_PAT
                UNDERSCORE "_"
              R_PAREN ")"
            WHITESPACE " "
            EQ "="
            WHITESPACE " "
            PATH_EXPR
              PATH
                PATH_SEGMENT
                  NAME_REF
                    IDENT "None"
          WHITESPACE " "
          BLOCK_EXPR
            STMT_LIST
              L_CURLY "{"
              R_CURLY "}"
        WHITESPACE "\n"
        R_CURLY "}"
  WHITESPACE "\n"