Whoops, these are the changes supposed to be in #18318.

p4raw-id: //depot/perl@18319

diff --git a/pad.c b/pad.c
index 634b762..34efeb0 100644 (file)
--- a/pad.c
+++ b/pad.c
@@ -1120,13 +1120,15 @@ Perl_pad_free(pTHX_ PADOFFSET po)
     if (PL_curpad[po] && PL_curpad[po] != &PL_sv_undef) {
        SvPADTMP_off(PL_curpad[po]);
 #ifdef USE_ITHREADS
+       /* SV could be a shared hash key (eg bugid #19022) */
+       if (
 #ifdef PERL_COPY_ON_WRITE
-       if (SvIsCOW(PL_curpad[po])) {
-           sv_force_normal_flags(PL_curpad[po], SV_COW_DROP_PV);
-       } else
+           !SvIsCOW(PL_curpad[po])
+#else
+           !SvFAKE(PL_curpad[po])
 #endif
+           )
            SvREADONLY_off(PL_curpad[po]);      /* could be a freed constant */
-
 #endif
     }
     if ((I32)po < PL_padix)

diff --git a/t/op/eval.t b/t/op/eval.t
index e81b9f7..8e8f69c 100755 (executable)
--- a/t/op/eval.t
+++ b/t/op/eval.t
@@ -1,6 +1,11 @@
 #!./perl
 
-print "1..84\n";
+BEGIN {
+    chdir 't' if -d 't';
+    @INC = '../lib';
+}
+
+print "1..87\n";
 
 eval 'print "ok 1\n";';
 
@@ -346,7 +351,8 @@ eval q{ my $yyy = 888; my $zzz = 999; fred5(); };
 {
    $eval = eval 'sub { eval "sub { %S }" }';
    $eval->({});
-   print "ok 78\n";
+   print "ok $test\n";
+   $test++;
 }
 
 # evals that appear in the DB package should see the lexical scope of the
@@ -375,3 +381,41 @@ our $x = 1;
     print DB::db5() == 3 ? 'ok' : 'not ok', " $test\n"; $test++;
     print db6()     == 4 ? 'ok' : 'not ok', " $test\n"; $test++;
 }
+require './test.pl';
+$NO_ENDING = 1;
+# [perl #19022] used to end up with shared hash warnings
+# The program should generate no output, so anything we see is on stderr
+my $got = runperl (prog => '$h{a}=1; foreach my $k (keys %h) {eval qq{\$k}}',
+                  stderr => 1);
+
+if ($got eq '') {
+  print "ok $test\n";
+} else {
+  print "not ok $test\n";
+  _diag ("# Got '$got'\n");
+}
+$test++;
+
+# And a buggy way of fixing #19022 made this fail - $k became undef after the
+# eval for a build with copy on write
+{
+  my %h;
+  $h{a}=1;
+  foreach my $k (keys %h) {
+    if (defined $k and $k eq 'a') {
+      print "ok $test\n";
+    } else {
+      print "not $test # got ", _q ($k), "\n";
+    }
+    $test++;
+
+    eval "\$k";
+
+    if (defined $k and $k eq 'a') {
+      print "ok $test\n";
+    } else {
+      print "not $test # got ", _q ($k), "\n";
+    }
+    $test++;
+  }
+}