I’ve just stumbled across something odd when using a nested for statement in a generator expression. I would have expected `collect((n,k) for n in 1:5, k in 1:n)`

to be equivalent to `collect((n,k) for n in 1:5 for k in 1:n)`

, just like

```
for n in 1:5, k in 1:n
...
end
```

is the same as

```
for n in 1:5
for k in 1:n
...
end
end
```

Instead, the single for statement produces the full 5x5 matrix of (n,k) combinations (equivalent to `collect((n,k) for n in 1:5, k in 1:5)`

) whereas the explicit double for statement produces only the pairs with k <= n (as expected).

Am I missing something here? I this done on purpose or a bug? I don’t find the behavior very intuitive. This is using Julia 1.7.1.