Making sense of recursion

[Colin]

On Monday, 25 June 2018 at 17:45:01 UTC, zbr wrote:
> Hi, this question is not specifically D related but I'll just 
> ask anyway. Consider the following snippet:
>
> [...]

Your mistake is in your visualization :-)

But... more like:

0 < 4 ? true : mergeSort(0,2) && mergeSort(3, 4)
And so on.

I.e, the it's not either or to run the second mergeSort, they 
both happen.