Eliminate xpad_cop_seq from _xnvu union

PVNV's used to be used to hold pad names (like '$lex'), but aren't used
for this purpose any more. So eliminate the xpad_cop_seq part of the
union.

Since S_scan_subst() was using xnv_u.xpad_cop_seq.xlow to store a
temporary line count, add a new union member for that.

The main usage of this field on CPAN is to define
COP_SEQ_RANGE_LOW()-style macros, so if the module is still using
xpad_cop_seq for that purpose, it's already broken.

1 files changed, 2 insertions, 2 deletions

diff --git a/pad.c b/pad.c
index bcbf95bb86..e810ccd056 100644
--- a/pad.c
+++ b/pad.c
@@ -1066,8 +1066,8 @@ associated with the C<PARENT_FAKELEX_FLAGS> field of a fake pad name.
 Note that C<pad_findlex()> is recursive; it recurses up the chain of CVs,
 then comes back down, adding fake entries
 as it goes.  It has to be this way
-because fake names in anon protoypes have to store in C<xlow> the index into
-the parent pad.
+because fake names in anon protoypes have to store in C<xpadn_low> the
+index into the parent pad.
 
 =cut
 */