anonsub.t: Improve test for [perl #71154]

When I authored commit 2c3743704, I thought I was just correcting the
error message at the time (from ‘Not a CODE reference’ to ‘Undefined
sub called’, since there is a sub), but it turns out I actually fixed
another bug at the same time.  Undefined anonymous subs were falling
back to supposedly-autoloaded __ANON__ subs.

Take this example, for instance:

    sub __ANON__ { warn 42 }
    $x = sub {};
    undef &$x;
    $x->();

This is the output I get:

$ pbpaste|perl5.14.0
42 at - line 1.
$ pbpaste|perl5.16.0
Undefined subroutine called at - line 4.

diff --git a/t/op/anonsub.t b/t/op/anonsub.t
index b83e4af..6b8745f 100644 (file)
--- a/t/op/anonsub.t
+++ b/t/op/anonsub.t
@@ -86,7 +86,8 @@ EXPECT
 ok 1
 ########
 # [perl #71154] undef &$code makes $code->() die with: Not a CODE reference
+sub __ANON__ { print "42\n" }
 undef &{$x=sub{}};
 $x->();
 EXPECT
-Undefined subroutine called at - line 3.
+Undefined subroutine called at - line 4.