I'm getting an unexpected "Program error:" in a situation where I don't
think "error" is being called. Moreover, the error message is bizarre,
though I can see in the gobbledy-gook the structure of the piece of my
program where things are going awry. The exact message (except for
addition of some line breaks) is:
Program error: {thenP_v1700 parser_v1798 ((initialSymbols [] (Num_fromInt
instNum_v33 0),Num_fromInt instNum_v33 0),ParseResult_Failed
(Posn_Pn_v1551 (Num_fromInt instNum_v33 0) (Num_fromInt instNum_v33 0)
(Num_fromInt instNum_v33 0)) "Parse error")}
Under what circumstances should I see such a strange "Program error:"
message?
In case it helps, here's the piece of my program that seems to match the
message above:
> case runP (parser (tokens input)) (initialSymbols [] 0, 0) of
> Ok (ast, st) -> do hPrint hOut ast
> hPutStrLn hOut ""
> hPrint hOut st
> Failed pos msg -> hPrint hOut (parseMsg pos msg)
The program works when, in the above snippet, the "Ok" case obtains. It
fails in the "Failed" case.
Of course, I could send the entire program if that would be useful.
I'm running the February 2000 version of Hugs on Solaris.
Thanks.
Dean Herington
heringto(a)cs.unc.edu
