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, 1 insertions, 4 deletions

diff --git a/sv.h b/sv.h
index 07719a6c08..7f43f3b5cf 100644
--- a/sv.h
+++ b/sv.h
@@ -487,10 +487,7 @@ perform the upgrade if necessary.  See C<L</svtype>>.
 union _xnvu {
     NV	    xnv_nv;		/* numeric value, if any */
     HV *    xgv_stash;
-    struct {
-	U32 xlow;
-	U32 xhigh;
-    }	    xpad_cop_seq;	/* used by pad.c for cop_sequence */
+    line_t  xnv_lines;           /* used internally by S_scan_subst() */
 };
 
 union _xivu {