Move test for #76540 to op/gv.t

Commit e5c69c9b added the test to dist/constant/t/constant.t, probably because
the bug was initially reported in combination with constant.pm. However, it was
a core bug in gv_init and can be reproduced easily without constant.pm.

With this change dist/constant can be safely synced back to CPAN without having
to SKIP or TODO this particular test.

2 files changed, 20 insertions, 15 deletions

diff --git a/dist/constant/t/constant.t b/dist/constant/t/constant.t
index 793ac0a72d..85a9355a19 100644
--- a/dist/constant/t/constant.t
+++ b/dist/constant/t/constant.t
@@ -9,7 +9,7 @@ END { @warnings && print STDERR join "\n- ", "accumulated warnings:", @warnings
 
 
 use strict;
-use Test::More tests => 97;
+use Test::More tests => 96;
 my $TB = Test::More->builder;
 
 BEGIN { use_ok('constant'); }
@@ -347,16 +347,3 @@ $kloong = 'schlozhauer';
     eval 'use constant undef, 5; 1';
     like $@, qr/\ACan't use undef as constant name at /;
 }
-
-# [perl #76540]
-# this caused panics or 'Attempt to free unreferenced scalar'
-# (its a compile-time issue, so the die lets us skip the prints)
-
-eval <<EOF;
-use constant FOO => 'bar';
-die "made it";
-print FOO, "\n";
-print FOO, "\n";
-EOF
-like($@, qr/made it/, "#76540");
-
diff --git a/t/op/gv.t b/t/op/gv.t
index 13da980365..cc8f205a85 100644
--- a/t/op/gv.t
+++ b/t/op/gv.t
@@ -12,7 +12,7 @@ BEGIN {
 use warnings;
 
 require './test.pl';
-plan( tests => 192 );
+plan( tests => 194 );
 
 # type coersion on assignment
 $foo = 'foo';
@@ -634,6 +634,24 @@ is (scalar $::{fake}, "*main::sym",
     );
 }
 
+# [perl #76540]
+# this caused panics or 'Attempt to free unreferenced scalar'
+# (its a compile-time issue, so the die lets us skip the prints)
+{
+    my @warnings;
+    local $SIG{__WARN__} = sub { push @warnings, @_ };
+
+    eval <<'EOF';
+BEGIN { $::{FOO} = \'bar' }
+die "made it";
+print FOO, "\n";
+print FOO, "\n";
+EOF
+
+    like($@, qr/made it/, "#76540 - no panic");
+    ok(!@warnings, "#76540 - no 'Attempt to free unreferenced scalar'");
+}
+
 __END__
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