my $utf8here, our $utf8here, and package variable $utf8here.

my $utf8here, our $utf8here, and package variable $utf8here.

The actual minimal fix is in utf8.c and from NI-S,
the rest are the tests (in fresh_perl since I couldn't get
them easily to work elsewhere) and a slight behaviour change:
previously UTF-8 identifiers had to start with an alphabetic
character.  No more so, now they can start with an (Unicode)
ID_Continue character (which however is not a (Unicode) digit).
(Limiting the first character to ID_Start would be rather
restrictive, since ID_Start allows only alphabetic letters.)

TODO: use vars qw($utf8here).  This I don't find to be
a showstopper.

p4raw-id: //depot/perl@15943