Version française
Home     About     Download     Resources     Contact us    

This site is updated infrequently. For up-to-date information, please visit the new OCaml website at

Browse thread
[Caml-list] ocamlyacc bug?
[ Home ] [ Index: by date | by threads ]
[ Search: ]

[ Message by date: previous | next ] [ Message in thread: previous | next ] [ Thread: previous | next ]
Date: -- (:)
From: Damien Doligez <Damien.Doligez@i...>
Subject: Re: [Caml-list] ocamlyacc bug?
On Tuesday, April 22, 2003, at 08:06 AM, SooHyoung Oh wrote:

> Is the following an ocamlyacc bug?

No.  At worst, it is a misfeature that results in an unclear error

> When making application with using ocamlyacc + ocamllex,
> you can make main function in trailer part (after second "%%") of 
> "foo.mly"
> It that case, it generates an error like this:
>     This expression has type Lexing.lexbuf -> Eg_parse.token
>     but is here used with type Lexing.lexbuf -> token

The problem in your source, is that you add your main function at
the end of the parser.  But this function uses the lexer, so you
make Eg_parse depend on Eg_lex.  But the design of ocamllex/ocamlyacc
is that the parser is declaring the type of tokens, and the lexer
opens the parser module to use this declaration, so it is Eg_lex
that depends on Eg_parse.

By adding your main function at the end of, you make a
circular dependency between eg_parse and eg_lex.  You should add your
main function at the end of eg_lex instead.

-- Damien

To unsubscribe, mail Archives:
Bug reports: FAQ:
Beginner's list: