Re: Opinion on undef lvalue

Message-ID: <20010617130446.B27925@lustre.linux.in>

Allow lvalue subs to return undef in array context.

p4raw-id: //depot/perl@10777

diff --git a/pp_hot.c b/pp_hot.c
index 5d43a79..d5da0ae 100644 (file)
--- a/pp_hot.c
+++ b/pp_hot.c
@@ -2315,18 +2315,16 @@ PP(pp_leavesublv)
        else if (gimme == G_ARRAY) {
            EXTEND_MORTAL(SP - newsp);
            for (mark = newsp + 1; mark <= SP; mark++) {
-               if (SvFLAGS(*mark) & (SVs_TEMP | SVs_PADTMP | SVf_READONLY)) {
+               if (*mark != &PL_sv_undef
+                   && SvFLAGS(*mark) & (SVs_TEMP | SVs_PADTMP | SVf_READONLY)) {
                    /* Might be flattened array after $#array =  */
                    PUTBACK;
                    POPSUB(cx,sv);
                    PL_curpm = newpm;
                    LEAVE;
                    LEAVESUB(sv);
-                   DIE(aTHX_ "Can't return %s from lvalue subroutine",
-                       (*mark != &PL_sv_undef)
-                       ? (SvREADONLY(TOPs)
-                           ? "a readonly value" : "a temporary")
-                       : "an uninitialized value");
+                   DIE(aTHX_ "Can't return a %s from lvalue subroutine",
+                       SvREADONLY(TOPs) ? "readonly value" : "temporary");
                }
                else {
                    /* Can be a localized value subject to deletion. */