I wrote:
> Perhaps I'm missing something, but if so, in what way is the
> "#if _MSC_VER >= 1600" stanza not totally useless given the
> immediately preceding macro redefinitions?
Some rummaging in the git history says that that stanza did something
when it was added (in 63876d3ba), but the later commit 73838b52 made
it redundant by making the earlier set of definitions unconditional.
Now it's merely confusing, so I'm going to take it out and repurpose
the comment.
regards, tom lane