Hmm, I know nothing about UTF7...

Anyway, looking at the code, the utf7Error code path can be called from
the following places (trunk line numbers):
- line 1595, and startinpos was set three lines before
- a bunch of places in the "if (inShift) { ... }" chunk between lines
1537 and 1578; inShift would have had previously been set to 1 and
that's at line 1587, a couple of lines after setting startinpos

So it seems things are fine, but perhaps I'm missing something.