SOURCE_FILE
  FN
    FN_KW "fn"
    WHITESPACE " "
    NAME
      IDENT "foo"
    PARAM_LIST
      L_PAREN "("
      R_PAREN ")"
    WHITESPACE " "
    BLOCK_EXPR
      STMT_LIST
        L_CURLY "{"
        WHITESPACE "\n    "
        LET_STMT
          LET_KW "let"
          WHITESPACE " "
          WILDCARD_PAT
            UNDERSCORE "_"
          WHITESPACE " "
          EQ "="
          WHITESPACE " "
          BLOCK_EXPR
            TRY_BLOCK_MODIFIER
              TRY_KW "try"
            WHITESPACE " "
            STMT_LIST
              L_CURLY "{"
              R_CURLY "}"
          SEMICOLON ";"
        WHITESPACE "\n    "
        LET_STMT
          LET_KW "let"
          WHITESPACE " "
          WILDCARD_PAT
            UNDERSCORE "_"
          WHITESPACE " "
          EQ "="
          WHITESPACE " "
          BLOCK_EXPR
            TRY_BLOCK_MODIFIER
              TRY_KW "try"
              WHITESPACE " "
              BIKESHED_KW "bikeshed"
              WHITESPACE " "
              PATH_TYPE
                PATH
                  PATH_SEGMENT
                    NAME_REF
                      IDENT "T"
                    GENERIC_ARG_LIST
                      L_ANGLE "<"
                      TYPE_ARG
                        PATH_TYPE
                          PATH
                            PATH_SEGMENT
                              NAME_REF
                                IDENT "U"
                      R_ANGLE ">"
            WHITESPACE " "
            STMT_LIST
              L_CURLY "{"
              R_CURLY "}"
          SEMICOLON ";"
        WHITESPACE "\n"
        R_CURLY "}"
  WHITESPACE "\n"
