comma operator causes hard to spot bugs

[bearophile]

Jonathan M Davis:

> There have been discussions about the comma operator before. I 
> don't expect that it's going anywhere,

Maybe there are intermediate solutions between keeping wild 
commas in D and disallowing them fully. I think most of my bugs 
caused by commas are similar to the one shown by the OP. This 
means this is not a common source of bugs:

foo(), bar();

While this is sometimes a trap:

auto x = foo(), bar();

So maybe it's enough to disallow using the last expression of a 
comma sequence as result of the whole expression? I don't know. I 
almost never use commas for such purposes. What are the use case 
for those commas?

Bye,
bearophile