On Fri, Oct 19, 2001 at 04:04:26PM +0800, Rafael 'Dido' Sevilla wrote:

> [I] have this exception defined in my parser.mly:
> 
> exception Undef_sym of string;
>  
> [...] compiler.ml does something like:
> 
> try
>   let result = Parser.main Lexer.token lexbuf in
>     ...
> with
>     Parser.Undef_sym x -> Printf.fprintf stderr "Undefined symbol %s" x
> 
> Unfortunately, compiling the compiler with this causes it to choke
> saying that Parser.Undef_sym is not found.  It's not in the generated
> parser.mli file, of course.  So apart from editing that (automatically
> generated) file manually, how do I get ocamlyacc to put them there?

Put your exception in a separate module, say syntax.mli:

exception Undef_sym of string

Then in parser.mly, you can do:

raise (Syntax.Undef_sym "Ooops!")

and in compiler.ml:

try
  ...
with 
  Syntax.Undef_sym x -> ...

Hope this helps.

-- 

Christian

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