The old COW code needs to use SvPVX_mutable when doing copy-on-write.

[p5sagit/p5-mst-13.2.git] / pp.c

diff --git a/pp.c b/pp.c
index 4feb59d..0e528cd 100644 (file)
--- a/pp.c
+++ b/pp.c
@@ -3121,8 +3121,7 @@ PP(pp_substr)
        else if (lvalue) {              /* it's an lvalue! */
            if (!SvGMAGICAL(sv)) {
                if (SvROK(sv)) {
-                   STRLEN n_a;
-                   SvPV_force(sv,n_a);
+                   SvPV_force_nolen(sv);
                    if (ckWARN(WARN_SUBSTR))
                        Perl_warner(aTHX_ packWARN(WARN_SUBSTR),
                                "Attempt to use reference as lvalue in substr");