X-Git-Url: http://git.shadowcat.co.uk/gitweb/gitweb.cgi?a=blobdiff_plain;f=t%2Fbasic.t;h=127cb396c7dc0bfac66a55e5a766436d9bbb69ab;hb=d6158a765909946609d49f5e09122a73ec923def;hp=4166e2dbc1e315cc952cf21ad7856cec40b4be9d;hpb=811a099c10b876edcc1167a58cf80bf42bc5eb4c;p=p5sagit%2FDevel-Size.git

diff --git a/t/basic.t b/t/basic.t
index 4166e2d..127cb39 100644
--- a/t/basic.t
+++ b/t/basic.t
@@ -3,7 +3,6 @@
 use Test::More tests => 19;
 use strict;
 use Devel::Size qw(size total_size);
-use Scalar::Util qw(weaken);
 
 can_ok ('Devel::Size', qw/
   size
@@ -84,8 +83,18 @@ cmp_ok (total_size(\&LARGE), '>', 8192,
 {
     my $a = [];
     my $b = \$a;
-    # making a weakref upgrades the target to PVMG and adds magic
-    weaken $b;
+    # Scalar::Util isn't in the core before 5.7.something.
+    # The test isn't really testing anything without the weaken(), but it
+    # isn't counter-productive or harmful to run it anyway.
+    unless (eval {
+	require Scalar::Util;
+	# making a weakref upgrades the target to PVMG and adds magic
+	Scalar::Util::weaken($b);
+	1;
+    }) {
+	die $@ if $] >= 5.008;
+    }
+
     is(total_size($a), total_size([]),
        'Any intial reference is dereferenced and discarded');
 }