[m-dev.] Tool for generating DU types in C

[Ralph Becket]

Julien Fischer, Monday, 22 March 2010:
> 
> On Sun, 21 Mar 2010, Ralph Becket wrote:
> 
> >     a_b_tree
> >     branch(a_b_tree l, a_b_tree r)
> >     {
> >         struct a_b_tree_branch *this =
> >         (struct a_b_tree_branch *)
> >             malloc(sizeof(struct a_b_tree_branch));
> >         if (this == NULL) {
> >             perror("a_b_tree:branch");
> >             exit(1);
> >         }
> >         this->_tag = _a_b_tree_branch_tag;
> >         this->l = l;
> >         this->r = r;
> >         if (l == NULL || r == NULL) {
> >             fprintf(stderr, "a_b_tree: branch cannot have NULL arguments.\n");
> >         }
> 
> Aren't you missing a call to exit() there?  Presumably you shouldn't
> keep executing if a branch does have a NULL argument?

That's a bug in the .du file: the NULL tests there are user-provided
code.
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