Re: Conservative GC isn't safe

[Eli Zaretskii <eliz@gnu.org>]

> From: Daniel Colascione <dancol@dancol.org>
> Date: Mon, 28 Nov 2016 09:51:37 -0800
> 
> struct foo* f = something();
> int* x = f->&field;
> something_else(); // invalidate global memory
> *x = 5; // f is dead here, but still in scope
> 
> Even if you don't write this kind of code, the compiler is allowed to 
> generate it.

But there's no such code in Emacs, and will never be.  Lisp objects we
create are either temporaries that can be GC'ed, or values that cannot
be GC'ed, in which case they are passed to some other code, either a
callee or returned as a value.  The only ones that can be dead as
above are the first variety, about which we don't care.