Re: [BUG] POSIX arith: inf, nan should be variables

[Daniel Shahaf <d.s@xxxxxxxxxxxxxxxxxx>]

Oliver Kiddle wrote on Sun, Nov 28, 2021 at 21:34:41 +0100:
> On 16 Nov, Vincent Lefevre wrote:
> > On 2021-11-15 18:40:17 +0100, Martijn Dekker wrote:
> > > $ zsh --emulate sh -c 'inf=1; nan=2; echo $((inf)) $((nan))'
> > > Inf NaN
> > > 
> > > Expected: 1 2
> >
> > FYI, this had already been discussed in April in this subthread:
> 
> And it'll probably come up again if we don't do anything. Unless anyone
> has better ideas, I'm inclined to go with the following variant of
> Martijn's patch.

Maybe add a test based on the above code snippet?

Cheers,

Daniel


> 
> diff --git a/Src/math.c b/Src/math.c
> index 4f24361a4..777ad9c31 100644
> --- a/Src/math.c
> +++ b/Src/math.c
> @@ -863,7 +863,7 @@ zzlex(void)
>  
>  		p = ptr;
>  		ptr = ie;
> -		if (ie - p == 3) {
> +		if (ie - p == 3 && !EMULATION(EMULATE_SH)) {
>  		    if ((p[0] == 'N' || p[0] == 'n') &&
>  			(p[1] == 'A' || p[1] == 'a') &&
>  			(p[2] == 'N' || p[2] == 'n')) {
>