[Nasm-devel] [Bug 3392716] Macro expansion behaviour

[Cyrill Gorcunov]

On Sun, Dec 13, 2020 at 08:55:26PM -0800, hpa at zytor.com wrote:
> 
> I doubt it has ever actually worked. If it had, it would be another thing.

So I think the final solution is to disable undefining/redefining macros
which are in process of expansion. Plain fatal error should be enough
as a first step I think.

Later we might extend the syntax and provide some kind of defer list
for macro undefinition.