Actually, now I see that this has nothing to do with Mac OS X.  I fail in the same way on a linux system when I try to compile:

    type foo = NAME of string
    class bar = object (self)
        method baz = NAME "test"
    end

If baz has an argument, it compiles without any problem.  Similarly, if baz returns a Big_int or just an integer, no problem.

Any suggestions?
    --Mike

> I'm attempting to use the ocaml-memprof patch for OCaml 3.12.0 on Mac OS X,
> but using the resulting ocamlopt often fails with an assertion:
> 
> Fatal error: exception Assert_failure("bytecomp/typeopt.ml", 569, 9)
> 
> This is an assertion in record_representation when the type parameter's desc
> field does not match what is expected (Tconstr).
> 
> Has anyone gotten ocaml-memprof to work on Mac OSX?  Otherwise, is there a
> description of the internals of this patch somewhere and/or a description of
> how the code generation differs between Mac OS X and Linux so I could get some
> idea of where to go from here?