Make unicode label tests use unicode_eval.

A recent change exposed a faulty test, in t/uni/labels.t;
Previously, a downgraded label passed to eval under 'use utf8;'
would've been erroneously considered UTF-8 and the tests
would pass. Now it's correctly reported as illegal UTF-8
unless unicode_eval is in effect.

1 files changed, 1 insertions, 0 deletions

diff --git a/t/uni/labels.t b/t/uni/labels.t
index 1e4d6840d1..3d7d476ae9 100644
--- a/t/uni/labels.t
+++ b/t/uni/labels.t
@@ -62,6 +62,7 @@ LÁBEL: {
         utf8::downgrade($prog);
     }
     if ($d--) {
+        use feature 'unicode_eval';
         no warnings 'exiting';
         eval $prog;
     }