[Bug fortran/47180] [OOP] EXTENDS_TYPE_OF returns the wrong result for disassociated polymorphic pointers

[dominiq at lps dot ens.fr]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=47180

--- Comment #9 from Dominique d'Humieres <dominiq at lps dot ens.fr> 2011-01-05 
18:41:36 UTC ---
> Simple solution:
>
> -     gfc_symbol *vtab;
> +     gfc_symbol *vtab = NULL;

This is the fix I have also reached and it allows gcc/fortran/trans-expr.c to
be compiled.