Jeff King <peff@xxxxxxxx> writes:
> Sure, that's one way to do it. But I don't see any point in not allowing
> "git checkout -b" to be another way of doing it. Is there some other use
> case for "git checkout -b" from an unborn branch? Or is there some
> harmful outcome that can come from doing so that we need to be
> protecting against? Am I missing something?
Mostly because it is wrong at the conceptual level to do so.
git checkout -b foo
is a short-hand for
git checkout -b foo HEAD
which is a short-hand for
git branch foo HEAD &&
git checkout foo
But the last one has no chance of working if you think about it, because
"git branch foo $start" is a way to start a branch at $start and you need
to have something to point at with refs/heads/foo.
So we are breaking the equivalence between these three only when HEAD
points at an unborn branch.
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