This is a border case which affects several dark corners in CPerl mode.
Per default, the '_' character is not a word character, but a symbol
character in Perl.

The bogus regexp in `cperl-find-pods-heres' checks the quote-like things
for "ending in a word boundary".  Per default there _is_ a word boundary
between 'y' and '_', and from here it goes downward.

It is wrong to change the search pattern to "symbol boundary" instead of
"word boundary": The ':' character is also a symbol in CPerl mode and
the regexp would then miss q:string: constructs.

The patch is a small change to eliminate the false detection of
quote constructs by yet another special case, plus some tests.
-- 
Cheers,
haj