Missing python-like chaining in D

[Dom DiSc]

On Monday, 21 February 2022 at 09:39:58 UTC, Mike Parker wrote:
>>a < b < c, are illegal:
>>
>> ((a < b) ? 1 : 0) < c // C rules (motivated by uniformity)
>> a < b && b < c // Python rules (motivated by math notation)
>>
So we learned, this is NOT the actual python rule, as this would 
indeed evaluate b twice. It's something more complicated:

a < b < c

will be lowered to:

auto tmp = b;
a < tmp && tmp < c

and if the chain gets longer, even more complicated:

a > b > c <= d

will  be lowered to

auto tmp1 = b;
auto tmp2 = c;
a > tmp1 && tmp1 > tmp2 && tmp2 <= d

and so on.